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SAT官方逐日一题附答案和解析[数学](2019年9月30日)

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Mathematics>Standard Multiple Choice

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

Lisa gives her little brother Sam a 15-second (sec) head start in a 300-meter(m) race. During the race, Sam runs at an average speed of 5 m/sec and Lisa runs at an average speed of 8 m/sec, not including the head start. Which of the following best approximates the number of seconds that had passed when Lisa caught up to Sam?

A.5
B.25
C.40
D.55



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