【SAT每日一题】2013年6月21日SAT官方每日一题

2013-06-23 13:30:00 来源: Collegeboard 责编：楷维留学指南

本文分享的是2013年6月21日SAT考试官方每日一题，希望对大家有所帮助！

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2013年6月21日SAT考试官方每日一题

题型：Mathematics > Standard Multiple Choice.

Read the following SAT test question and then click on a button to select your answer.

A woman drove to work at an average speed of miles per hour and returned along the same route at miles per hour. If her total traveling time was hour, what was the total number of miles in the round trip?

(B)

(C)

(D)

(E)

2013年6月21日SAT考试官方每日一题正确答案: C

解析:

Let represent the time it took the woman to drive to work. Since her total traveling time was hour, the time it took her to return home is 1 minus t . The distance in miles can be found using the formula distance = (rate) times (time) . The distance traveled to work is 40 times t , and the return distance is 30 times (1 minus t) . Since the distance to work is the same as the return distance, 40 times t = 30 times (1 minus t) . Solving for yields t = (3 over 7) . So the distance one way is 40 times (3 over 7) = (120 over 7) = 17 and (1 over 7) miles. The total number of miles in the round trip is 2 times (17 and (1 over 7)) , or 34 and (2 over 7) miles.