2. 外语
  3. A train traveling at a speed of 80 mph enters a tunnel that is 0. 5 mile long. The length of the train is 0. 25 mile. How long d

A train traveling at a speed of 80 mph enters a tunnel that is 0. 5 mile long. The length of the train is 0. 25 mile. How long d

admin2008-03-12  21
问题 A train traveling at a speed of 80 mph enters a tunnel that is 0. 5 mile long. The length of the train is 0. 25 mile. How long does it take for all of the train to pass through the tunnel, from the moment the front enters, to the moment the rear emerges?
选项 A、One minute.
B、Two minutes.
C、Three minutes.
D、Four minutes.
答案A
解析 由于车头进隧道到车尾出隧道这一段时间也要包括在内，因此火车通过的路程实际上是隧道长加车长，即0．5+0．25=0．75(miles)。则可列方程80miles／60minutes=0.75miles／x，x=0．5625(minute)≈1minute．故选项A正确。
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