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2018/6/25 笔试-答题解析 名企实习 校招助手 笔试题库 制作简历 求职探索 企业入口 我的教室 Derek 咨询行业 奥纬咨询(Oliver Wyman)第一套 / 数字推理 试卷报告 / 查看解析 查看错题解析 查看全部解析 题号 正确 错误 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 The students in a certain finance course can be divided into 3 equal groups with a remainder 1、Which of the following can be the number of students in the class? of one student, or into 5 equal groups with a remainder of 2 students. A、91 B、92 C、94 D、96  E、97 参考答案：E 你的答案： 错误 解析：The best answer is E. The easiest way to solve this question is through the answers. For each answer check the remainder when divided by 5, and by 3. The only answers that have a remainder of 2 when divided by 5 are B and E, out of which only E has a remainder of 1 when divided by 3. You can also see the more comprehensive solution that might also help you in other questions involving remainders: Numbers that have a remainder of 1 when divided by 3: 1,4,7,11,14,17,20... Numbers that have a remainder of 2 when divided by 5: 2,7,12,17... We found a number that answer both constraints: 7, but there is an infinite number of numbers that answer both constraints. How can we find them? The numbers are 7+Kx(The LCM of 3 and 5), where K is an integer. The LCM (Least Common Multiple) of 3 and 5 is 15, and therefore the numbers that answer both constraints are: 7+0x(15), 7+1x(15), 7+2x(15)... 7+6x(15) 7,22,37,52... 97. 本题正确率67.1%，易错项为A 有疑问 加入收藏 M, N, P, Q are points on the number line, from left to right in that order. Points P and Q are 2、What is the value of N? equidistant from zero, MN is half of NP and PQ=MN=|8|.  A、-20 B、-16 C、-8 D、4 E、16 参考答案：A 你的答案： 错误 解析：The best answer is A. Points P and Q are equidistant from zero and therefore they have the same absolut value. Since PQ is equal to 8, the value of P is -4, and the value of Q is 4. MN = 0.5 x NP: 8 = 0.5 x NP: NP = 16. N is to the left of P, and therefore it is equal to P-16. P = -4, so N = -4-16 = -20. 本题正确率44.6%，易错项为C 有疑问 加入收藏 In a certain university, each student has to take 7 tests on each semester. 3、What is the probability of passing exactly 4 tests in a semester, if the probability of failing the test is 18%? A、0.82^4 B、0.18^4 x 4 x 3 C、0.82^4 x 0.18^3 D、0.82^4 x 0.18^3 x 7  E、0.82^4 x 0.18^3 x 35 参考答案：E 你的答案： 错误 解析：暂无解析 本题正确率26.8%，易错项为C 有疑问 加入收藏 https://rcweb.review.xiaozao.org/exam/result/113061?freeId=1 1/92018/6/25 笔试-答题解析 You have a drawer filled with white, grey and black socks. 4、What is the maximum number of socks that need to be removed from the drawer in order to guarantee four matching pairs of socks? A、8 B、9  C、10 D、11 E、12 参考答案：C 你的答案： 错误 解析：The correct answer is C. In this case, we are looking for the maximum number of socks, so we will check against the worst case scenario: The first 3 socks removed will be one of each colour. The 4th sock: must match one of those since there are only 3 colours, so that now we have 1 pair and 2 singles. 5th sock worst case: is that it is the same as the couple we already have, so that now there is 1 pair and 3 singles. If we go on the same way 6th removal: must match one of the singles. We now have 2 pairs and 2 singles. 7th removal: will add another single. 8th removal- will match one of the 3 – we now have 3 pairs. 9th removal: will add another single. 10th must match one of the 3 singles – so that we have 4 pairs as asked. 本题正确率23.5%，易错项为E 有疑问 加入收藏 A firm owns 6 red cars, 12 silver cars and 8 blue cars. Half of the red cars, 1/3 of the silver cars 5、What is the probability that certain employee, which holds a car, is driving a red or and 1/8 of the blue cars are convertibles. blue convertible? A、1/16  B、2/13 C、4/25 D、1/2 E、4/7 参考答案：B 你的答案： 错误 解析：The best answer is B. The total number of cars is 26. Out of which, there are 3 red convertibles and 1 blue convertible, thus the probability of getting a red or blue convertible is (3+1)/26 = 2/13 本题正确率41.8%，易错项为D 有疑问 加入收藏 How many different ways are possible to arrange 2 girls and three boys on a bench of five, so 6、Please choose the right anwser from the following options. that at least 2 boys will seat next to each other? A、12 B、24 C、48  D、108 E、120 参考答案：D 你的答案： 错误 解析：The best answer is D. The only way to arrange the five people on the bench, without having two boys seating next to each other is: B-G-B-G-B (when, B-Boy, G-Girl). The number of ways to arrange the students as requested is: (All options) - (This specific option) = 5! - (2! x 3!) = 120 - (2 x 6) = 120-12 = 108. Notice that in that specific option the internal order of the Boys and of the Girls may differ, so there are (2! x 3!) options to subtract. In the specific option: 2! represents the girls' possible arrangements and 3! represents the boys' possible arrangements. 本题正确率21.1%，易错项为C 有疑问 加入收藏 Drink A is 55% water by volume. Drink B is 40% water by volume. 7、If some Drink A and Drink B are mixed together such that the mixture is 46% water by volume, what percentage of the mixture is Drink B? A、40% B、50% C、55%  D、60% E、63% 参考答案：D 你的答案： 错误 解析：The correct answer is D. If x is the amount of Drink B, then the formula for the mixture is [0.4*x + 0.55*(1-x)] = 0.46 Solving this equation we receive: x = 0.6 = 60% Please note, if you are struggling with this question / explanation please refer to our basic drills and tutorials. https://rcweb.review.xiaozao.org/exam/result/113061?freeId=1 2/92018/6/25 笔试-答题解析 本题正确率26.3%，易错项为A 有疑问 加入收藏 You are carrying some change in your pocket. A person approaches you and asks if you can 8、What is the most amount of change you can have in your pocket? *Available $ coins give him change for a $1 bill. You examine all the change in your pocket and discover that are 0.01 | 0.05 | 0.1 | 0.25 you cannot give him exact change for his $1 bill. A、$0.99 B、$1.04 C、$1.09  D、$1.19 E、$1.24 参考答案：D 你的答案： 错误 解析：The correct answer is D. While the dollar represents an american currency, you are still expected to answer the question, since the currency units are provided. You can have up to 3 quarters because 4 quarters would enable you to make change for the $1 bill. 3 quarters is $0.75. You can have up to 4 dimes ($0.1 coins) because 5 dimes would combine with 2 of the quarters to make change for the $1 bill. 4 dimes is $0.40. You cannot have any nickels ($0.05 coins) because even one nickel could combine with the 3 quarters and 2 of the dimes to make change for the $1 bill. You can have up to 4 cents because 5 cents would add up to the nickel that would allow you to make change for the $1 bill. 4 cents is $0.04. Thus, the maximum total change you can have in your pocket without being able to make change for the $1 bill is $1.19. 本题正确率15%，易错项为A 有疑问 加入收藏 If the ratio of the area of a circle to the circumference of the circle is 5:4 9、What is the diameter of the circle? A、16/5 B、8/5 C、5/4 D、5/2  E、5 参考答案：E 你的答案： 错误 解析：The correct answer is E. The area of a circle is A=πr2. The circumference of a circle is C = 2πr. If the ratio between the two is 5:4, then πr2/2πr = 5/4 => 4πr2=10πr, therefore, r = 10/4 = 5/2. The diameter of a circle is D = 2r = 2 x 5/2 = 10/2 = 5. 本题正确率20.2%，易错项为D 有疑问 加入收藏 Imagine a square with side length 3. If the square is divided into 9 smaller squares of side 10、What is the ratio of the perimeter of the original square to the total perimeter of the length 1 9 smaller squares? A、1:9  B、1:3 C、1:1 D、3:1 E、9:1 参考答案：B 你的答案： 错误 解析：The correct answer is B. The perimeter of the original square is 3 * 4 = 12. The perimeter of one of the smaller squares is 1 * 4 = 4. There are 9 such squares so the total perimeter of all 9 squares is 9 * 4 = 36. The ratio is 12:36 which is 1:3. 本题正确率31.9%，易错项为C 有疑问 加入收藏 The lockers in a certain school are numbered from 1 to 100,000 inclusive. 11、What is the probability that a student will get a locker with a 4-digit number? A、0.01  B、0.09 C、0.1 D、0.19 E、0.9 参考答案：B 你的答案： 错误 https://rcweb.review.xiaozao.org/exam/result/113061?freeId=1 3/92018/6/25 笔试-答题解析 解析：The best answer is B. The total number of lockers is 100,000. The number of 4-digit numbers from 1000 to 9999 is 9999-1000+1=9000. The probability of getting a locker with a 4-digit number is 0.09 . 本题正确率23.5%，易错项为C 有疑问 加入收藏 A baseball player has a 35% chance to get on base when the pitcher is right-handed and a 12、If 90% of all pitchers are right-handed, what is the probability that the baseball 27% chance to get on base when the pitcher is left-handed. player will get on base? A、27% B、28.8% C、31.5%  D、34.2% E、35% 参考答案：D 你的答案： 错误 解析：The correct answer is D. The baseball player has a 35% chance to get on base when the pitcher is right-handed and 90% of all pitchers are right-handed. 35% * 90% = 31.5%. The baseball player has a 27% chance to get on base when the pitcher is left-handed and 10% of all pitchers are left-handed. 27% * 10% = 2.7%. The probability of the baseball player getting on base is 31.5% + 2.7% = 34.2%. 本题正确率24.4%，易错项为C 有疑问 加入收藏 John invested $1,200 in a deposit that pays 12% simple annual interest. 13、If the interest was compounded semi-annually, how much more interest would he gain?  A、4.32 B、5.41 C、8.63 D、55.21 E、72.3 参考答案：A 你的答案： 错误 解析：The best answer is A. The interest gained in a one-year $1200 deposit with simple annual interest rate of 12% is $1200 x 1.12. The interest gained in a one-year $1200 deposit with semi annually compounded interest rate of 12%, is $1200 x (1.06)2. You can find the actual numbers and find the difference, but you can save precious time by using a different technique: When the interest is compounded semi-annually, after 6 months the interest gain is 6% on the deposit, and after another 6 months the interest gain is 6% on the total deposit, meaning 6% on the initial deposit ($1200) + 6% on the interest that was gained after the first 6 months. Hence, the difference between simple interest and semi-annually compounded interest is only $1200 x 0.062. So the difference is : $1200 x 0.06 x 0.06 = 12 x 6 x 0.06 = 12 x 6 x 6/100 = 432 / 100 = 4.32 本题正确率18.3%，易错项为E 有疑问 加入收藏 In Thailand it rains exactly five days in every week. 14、If a tourist takes an umbrella with him only on even days of the week, which of the following is closest to the probability that the tourist will not get wet on a given day? A、16% B、33% C、36% D、41%  E、59% 参考答案：E 你的答案： 错误 解析：The best answer is E. In order for the tourist to get wet two things need to happen: it should rain and he should not take the umbrella (condition 1 AND condition 2). Hence, the probability that the tourist will get wet is equal to the probability that it will rain multiplied by the probability that he will not take his umbrella. The probability that it will rain on a given day is 5/7, and the probability that the tourist will not take his umbrella on a given day is 4/7. Hence, the probability that the tourist will get wet is : 5/7 x 4/7 = 20/49 We were asked about the probability that the tourist will not get wet, which is equal to: 1-(the probability that he will get wet) = 1-(20/49) = 29/49. 30/50 is equal to 60%, so 29/49 is a bit less than 60% 本题正确率9.4%，易错项为C 有疑问 加入收藏 There is a circular outdoor ice skating rink. The machine that prepares the rink for skating at 15、If the circumference of the rink is 200 feet, approximately how many minutes does it the start of the day prepares 600 square feet of rink every hour. take the machine to prepare the entire rink for skating at the beginning of each day? A、5 https://rcweb.review.xiaozao.org/exam/result/113061?freeId=1 4/92018/6/25 笔试-答题解析 B、32 C、64  D、318 E、3183 参考答案：D 你的答案： 错误 解析：The correct answer is approximately 318 minutes. C = 2*π*r. If the circumference of the rink is 200 feet, then the radius of the rink is 100/π. A = π*r2, therefore the area of the rink is 10000/π. If the machine prepares 600 square feet every hour, then it takes (10000/π)/600 = 50/3π hours in order to prepare the entire rink. Multiply this result by 60 to convert from number of hours to number of minutes: (50*60)/3π = 1000/π. Since π≈3.14, the correct answer must be 318 minutes. 本题正确率12.2%，易错项为B 有疑问 加入收藏 A company sold three types of widgets this past year. Sales of widget A accounted for 30% of 16、If the company meets its goal of doubling its profits with the projected changes in the company's profits. Sales of widget B accounted for 20% of the company's profits. Total the profits generated by its three widgets, what percentage of the company's next-year profits from widget C equaled $10000. The company wants to double its previous-year profits profits will be accounted for by sales of widget B? for this year. The company projects that profits from widget A will increase by 10% and A、25% profits from widget C will decrease 15%. Profits from widget B are projected to make up the difference. B、42.25%  C、62.25% D、211.125% E、311.125% 参考答案：C 你的答案： 错误 解析：The correct answer is C. If 30% of the profit is from A and 20% of the profit is from B then 50% must be from C. If the numerical profit from C is $10000 then 50% of the total profits must be $10000. The total profit for the company from the past year is then $20000. Profit from the sale of A is $6000 and from the sale of B is $4000. If profits from the sales of widget A will increase 10%, then next year the company will profit $6600 from the sales of widget A. If profit from the sales of widget C will decrease 15%, then next year the company will profit $8500 from the sales of widget C. If total company profits are to double next year, then total profit must be $40000. If widget A will generate $6600 and widget C will generate $8500, then widget B must generate $24900 in profit. The percentage of next-year's profits generated by widget B is ($24900/$40000)x100 = 62.25%. 本题正确率12.2%，易错项为A 有疑问 加入收藏 17、What is the area of the circle if the area of the isosceles right triangle inscribed in the circle is 10 and the hypotenuse is the diameter of the circle? A、π√(10) B、π√(20) C、5π  D、10π E、20π 参考答案：D 你的答案： 错误 解析：The correct answer is D. The area of a triangle is bh/2. For an isosceles right triangle, b=h so the area is b2/2 = 10. b2 = 20 so b = √(20). The hypotenuse is 2*√(10) (i.e. √(40)) which is the diameter of the circle. The radius is √(10) so the area of the circle is 10π. 本题正确率13.1%，易错项为C 有疑问 加入收藏 An investor wants to put money into a mutual fund that promises 6% growth each year. 18、If the investor puts $100 into this mutual fund and the mutual fund delivers on its promise of 6% growth each year, approximately how many years will it take for the investment to be worth $200? A、6 B、11  C、12 D、16 E、17 参考答案：C 你的答案： 错误 https://rcweb.review.xiaozao.org/exam/result/113061?freeId=1 5/92018/6/25 笔试-答题解析 解析：The correct answer is C. The first year, the $100 investment gains 6%, which is $6, to be worth $106. The second year, the $106 gains another 6%, which is $6.36, to be worth $112.36. Algebraically, this can be rewritten as 100*1.06t = 200, or 1.06t = 2, where t is the number of years that the $100 is invested. Solving for t gives an answer of 11.896 which is approximately 12. 本题正确率15.5%，易错项为B 有疑问 加入收藏 A rectangular garden is 5m long and 13m wide. A fence is built around the garden, leaving a 19、What is the distance of the diagonal line between two opposite corners of the 1m gap at each side. fence. A、√(222) B、16  C、√(274) D、18 E、22 参考答案：C 你的答案： 错误 解析：The correct answer is C. If the garden is 5x13, then the fence is 7x15. Since the fence is a rectangle, the diagonal is the hypotenuse of the right triangle whose legs are the left side of the fence and the bottom side of the fence. a2+b2=c2. In this case, a = 7 and b = 15. Therefore, c = √(274). 本题正确率15%，易错项为D 有疑问 加入收藏 The manager of an accountancy office gave his employees a bonus at the end of the year. 20、If the total amount of bonuses was less than $2000, and the bonuses are in whole The ratio between the bonus Annie received to the bonus Sally received was 3 to 4, and the dollars, what is the largest bonus that Annie could have received? ratio between the bonus Jake received to the bonus Sally received was 7 to 8. A、95 B、285 C、380 D、423  E、570 参考答案：E 你的答案： 错误 解析：The best answer is E. A/S = 3/4 = 6/8 A:S:J = 6:8:7. The maximum bonus for Annie is when Annie, Sally and Jake are the only employees who receive the bonus. In that case, the total amount of bonuses = 6X + 8X + 7X = 21X. Because the bonuses were given in whole dollars, the total amount of bonuses has to be divided by 21. The greatest number smaller than 2000 and divisible by 21 is 1995, and therefore 21X = 1995, X = 95. The largest bonus that Annie could have received is 6X = 6 x 95=$570. 本题正确率10.8%，易错项为C 有疑问 加入收藏 You roll two six-sided dice. If one die is 3 or less, what is the probability that the sum of the 21、Please choose the right answer from the following options. two dice is greater than 6?  A、1/3 B、2/5 C、1/2 D、3/5 E、3/4 参考答案：A 你的答案： 错误 解析：The correct answer is A. (1,6), (2,5), (2,6), (3,4), (3,5), (3,6) give the desired result of a sum greater than 6. (1,1), (1,2), (1,3), (1,4), (1,5), (2,1), (2,2), (2,3), (2,4), (3,1), (3,2), (3,3) do not give the desired result of a sum greater than 6. Overall probability of a sum greater than 6 is 6/18 which is 1/3. 本题正确率9.4%，易错项为C 有疑问 加入收藏 A store offers a set of earrings and necklace for a 10% discount when they are bought 22、What is the percent of the profit over the cost when the items are sold as a set? together. When each item is bought alone, the full price is charged. If the selling price of the  A、8% necklace is $72 and the selling price of the earrings is $48, and the profit on each is 20% of the cost. B、10% C、18% D、20% E、36% https://rcweb.review.xiaozao.org/exam/result/113061?freeId=1 6/92018/6/25 笔试-答题解析 参考答案：A 你的答案： 错误 解析：The best answer is A. If the cost of the necklace is x, then 1.2 x = 72, x = $60. If the cost of the earrings is y, then 1.2y = 48, thus y = $40. When they are sold as a set, the selling price is 0.9 x (72 + 48) = $108, thus the percentage of profit on the cost is. 本题正确率8.5%，易错项为C 有疑问 加入收藏 Your wallet contains $1, $5, $10 and $20 bills. You have twice as many $20 bills as $5 bills. 23、How much money is in your wallet? You have 3 more $10 bills than $1 bills. You have as many $5 bills as $1 bills. You have 4 $1 A、$36 bills. B、$72 C、$124 D、$204  E、$254 参考答案：E 你的答案： 错误 解析：The correct answer is E. We know there are 4 $1 bills, which worth are 4*$1=$4 in total. We are told that there are as many $5 bills as $1 bills. Therefore, there are 4 $5 bills as well, which are worth 4*$5=$20 in total. We also know that there are 3 more $10 bills than $1 bills, meaning that there are 4+3=7 $10 bills, which are worth 7*$10 =$70 in total. Finally, we know that there are twice as many 20$ bills as 5$ bills, meaning that there are 4*2=8 $20 bills, which are worth 8*$20=$160 in total. Now we can add them all together: $4+$20+$70+$160=$254 There is $254 in the wallet. 本题正确率11.3%，易错项为C 有疑问 加入收藏 A right triangle has legs of length x-1 and 2x+2 and a hypotenuse of length 2x+4. If two such 24、What is the area of that rectangle? right triangles are attached to each other on their hypotenuses to form a rectangle. A、120  B、240 C、260 D、624 E、There is not enough information to solve this problem. 参考答案：B 你的答案： 错误 解析：The correct answer is B. For a right triangle, a2 + b2 = c2. That means that (x-1)2 + (2x+2)2 = (2x+4)2. x2 - 2x + 1 + 4x2 + 8x + 4 = 4x2 + 16x + 16. Combining like terms reduces to 5x2 + 6x + 5 = 4x2 + 16x + 16. x2 - 10x - 11 = 0. (x-11)*(x+1) = 0. x = 11, -1. If x = 11, the sides of the right triangle are 10, 24 and 26. If x = -1, the sides are -2, 0, and 2 which is impossible. Therefore, x = 11 and the right triangle has sides 10, 24 and 26. If the legs of the right triangle are 10 and 24, then the area of the rectangle made with two such right triangles is 240. 本题正确率10.3%，易错项为C 有疑问 加入收藏 There are 5 males and 4 females in a certain club . If a group of 3 members is formed. 25、What is the probability that all the members in the group will be from the same gender? A、1/8 B、1/7  C、1/6 D、1/5 E、1/4 参考答案：C 你的答案： 错误 解析：The best answer is C. The total number of options to choose a group of 3 members is: 9!/(6! x 3!) = 84. The number of options to choose a group of 3 males is: 5!/(3! x 2!) = 10. The number of options to choose a group of 3 females is: 4!/(1! x 3!) = 4. Therefore, the probability to choose a group of 3 members from the same gender is: 10+4/84 = 14/84 = 7/42 = 1/6 . *A reminder- the formula used to solve this question is the number of possible combinations of r objects in a set of n objects: n!/r!(n-r)! n= the number of people to choose from r= how many we chose out of n. The “!” symbol is the symbol for the factorial function that multiplies a series of descending natural numbers. For example, 4! = 4 × 3 × 2 × 1. In addition, when the order in each inner arrangement is not important we must divide the formula by the number of places (or members)! Thus, we had to divide the number of options for each group by: 3! (the number of members in each group). So, the revised formula used in this question was: n!/[(n-r)! x (no. of inner arrangements)!] 本题正确率8.5%，易错项为B 有疑问 加入收藏 Lea had $2,400 in her bank account, she spent 1/6 of the money on rent, and from the 26、What fraction of the initial amount was left in her bank account? reminder she paid 2/5 for the credit card company. If Lea spent another $450 on a new coffee A、29/240 table. https://rcweb.review.xiaozao.org/exam/result/113061?freeId=1 7/92018/6/25 笔试-答题解析 B、7/48 C、1/4  D、5/16 E、11/15 参考答案：D 你的答案： 错误 解析：The best answer is D. The amount of money left after paying the rent was: (1-1/6) X 2400 = 5/6 X 2400 = 2,000 After paying the credit card company she had left: (1-2/5) x 2000 = 3/5 X 2000 = 1,200 The total amount left is 1200-450 = $750, and therefore the fraction that was left out of the original amount is 750/2400 = 75/240 = 25/80 = 5/16 本题正确率11.7%，易错项为C 有疑问 加入收藏 x and y are different integers between -3 and 3 inclusive. 27、What is the probability that |X| = |Y|?  A、1/7 B、3/7 C、3/14 D、2/14 E、3/5 参考答案：A 你的答案： 错误 解析：The best answer is A. There are three possible pairs: 3 and -3, 2 and -2, 1 and -1 (Note that x and y cann't both be equal to 0 since we are given that x and y are different integers). The total number of possible pairs is 7!/(2!5!) = (6x7)/2 = 3x7 = 21. Hence, the probability that |X| = |Y| is 3/21= 1/7 本题正确率9.4%，易错项为C 有疑问 加入收藏 A rectangular prism has a length of 5, a width of 3 and a height of 2. 28、What is the difference between the length of the rectangular prism and the length of any side of a cube with the exact same volume as the rectangular prism? A、5-√(30)  B、5-3√(30) C、3√(30) D、√(30) E、5 参考答案：B 你的答案： 错误 解析：The correct answer is B. The volume of the rectangular prism is 5*3*2=30. The volume of a cube of side length s is V = s3. If the volumes of the rectangular prism and cube are equal, then s3 = 30. Therefore, the length of a side of the cube is 3√(30). So the difference in length between the rectangular prism and cube is 5-3√(30). 本题正确率9.9%，易错项为C 有疑问 加入收藏 A basketball player scored 5 more points in the most recent game than the previous game. 29、How many points did the basketball player score in the previous game? The basketball player also scored twice as many points in the most recent game than the A、18 game before the previous game. If the total number of points scored by the basketball player in all three games is 85.  B、31 C、36 D、80 E、85 参考答案：B 你的答案： 错误 解析：The correct answer is B. If the basketball player scored x points in the game before the previous game, then he scored 2x points in the most recent game. Therefore, the basketball player scored 2x-5 points in the previous game. x + 2x + 2x – 5 = 85. 5x = 90. x = 18. Therefore, the basketball player scored 31 points in the previous game. 本题正确率10.8%，易错项为C 有疑问 加入收藏 Robert and William are running towards each other from point A and point B, respectively, 30、At what time will William be back at point B? which are 60 km apart. When they meet, they turn around and run back to their starting A、9:00 points. If they both started running at 08:00, Robert at an average speed of 25 km/hour and William at a speed of 15 km/hour. B、9:30 https://rcweb.review.xiaozao.org/exam/result/113061?freeId=1 8/92018/6/25 笔试-答题解析  C、11:00 D、11:30 E、12:00 参考答案：C 你的答案： 错误 解析：The best answer is C. When Robert and William run towards each other, add their speeds to find when they will meet: t = d/v = 60/40 = 1.5 , They will meet after 1.5 hours. After they meet, each of them runs back to his starting point. The distance that William made from point B to the meeting point is 1.5 x 15=22.5 km. He has to run back the same distance at the same speed, it will also take him 1.5 hours, So, William will be back in point be 3 hours after 08:00, at 11:00. 本题正确率16.9%，易错项为D 有疑问 加入收藏 小灶教育 职位投递 求职课程 求职工具 小灶教育是北美顶尖MBA团队创建的面向大学生的一站式定制化职业发展教育平台。 网站首页 名企实习 线上课程 制作简历 在这里，学生可以获得匹配个人职业发展需求的一站式解决方案：包括职业探索指 导、线上线下课程、求职工具、以及职位信息等。 求职探索 校招助手 笔试题库 京ICP备15065001号-1 联系邮箱：info@xiaozao.org Copyright © 2015-2017 xiaozao. All Rights Reserved. https://rcweb.review.xiaozao.org/exam/result/113061?freeId=1 9/9