2. 外语
  3. At 9:00 a. m. train T left the train station and two hours later train S left the same station on a parallel track. If train T a

At 9:00 a. m. train T left the train station and two hours later train S left the same station on a parallel track. If train T a

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问题 At 9:00 a. m. train T left the train station and two hours later train S left the same station on a parallel track. If train T averaged 60 kilometers per hour and train S averaged 75 kilometers per hour until S passed T, at what time did S pass T?
选项 A、2:00 p.m.
B、5:00 p.m.
C、6:00 p.m.
D、7:00 p.m.
E、9:00 p.m.
答案D
解析 火车T于上午9：00离开车站，两小时后，火车S离开同一车站，且运行在平行的轨道上。若火车T的平均速度为60Km／h，火车S在超过火车T之前的平均速度为75Km／h，在几点钟S超过T?
解：本题的正确答案为(D)。设x小时后S追上T，此时两火车运行的距离相等，即：(x+2)×60=x×75 => x=8，S在T出发10小时后，即7：00 p．m追上T。
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