GWD-13-35

Q35:

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 Y, 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.

答案是C,我觉得应该选D阿，只要知道其中一个的路程就够了吧，还请NN指教啊

答案应该是A吧。有讨论过。

P前面average 70mile，两个小时跑了140，那么Q跑了110。

而(2)明确指出是entire trip，可以前面两小时猛开，相遇后再磨蹭，保障平均数就行了；或者前面磨蹭，相遇后再猛开。。。

借此宣布charmant复出了

恭喜charmant复出，已在其他论坛久仰大名！！呵呵

非常感谢，我的答案也是A