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题库 / OG2017Q-DS-298
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.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
题目分析：
（1） 相遇时，P火车过去的平均时速为每小时70英里。所以，相遇时P火车行驶的距离为70*2=140英里，此时P距离终点为250-140=110英里。所以Q火车离终点距离为140英里，P火车离终点更近。题目得解。
（2） 仅根据条件2，不知道P的速度，也就无法计算火车相遇的时间，无法计算相遇时离终点的距离。不满足要求
因此，本题答案为（A），仅条件1可以解题，条件2不行。
所以这题考英语？。
读题目没读明白什么意思。。。。。。
这题考阅读。粗心了，条件一给的是平均速度，而不是即是速度
12理解反了
At the time when the train passed
没认真看题
理解错了Stations X and Y are connected by two separate, straight, parallel rail lines 这句话
（2）的意思是Q整个路程的平均速度是55，可能过程中会有变速，无法推算出相遇时Q走了多少。
had averaged a speed of 70 miles理解有误，注意时态
教训是读statement要每一个都读清楚