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SAT官方每日一题附答案和解析[数学](2017年6月15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

重点单词   查看全部解释    
solve [sɔlv]

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v. 解决,解答

 
multiple ['mʌltipl]

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adj. 许多,多种多样的
n. 倍数,并联

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equation [i'kweiʃən]

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n. 相等,方程(式), 等式,均衡

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