Data Sufficiency

试题详情

题目:

Stations X  and Y  are connected by two separate, straight, parallel rail lines that are 250 miles long.  Train P and train Q  simultaneously left Station X  and Station , respectively, and each train traveled to the other's point of departure.  The two trains passed each other after traveling for 2 hours.  When the two trains passed, which train was nearer to its destination?
(1)     At the time when the two trains passed, train P had averaged a speed of 70 miles per hour.
(2)       Train Q  averaged a speed of 55 miles per hour for the entire trip.

选项:

答案:

A

提问:

(1)中说的at the time 并不能说明之前的速度是多少,所以不能得出啊。。。
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