GWD 13 数学帮帮忙啦

LeannaChina · 发表于 2011-2-19 19:24:30

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.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
Answer:

答案是 a 如果是a 的话我认为D也对呀不懂了

sdcar2010 · 发表于 2011-2-19 21:29:21

NO.

Use condition 1 you can tell where P is from X. Sufficient.

Since condition 2 is about the WHOLE trip, not the average speed during the first 2 hours of driving, it is not sufficient. For example, the train Q can be as slow as snail during the first 2 hours and as fast as light during the rest of the trip, or vice versa.

LeannaChina · 发表于 2011-2-19 22:55:27

哦酱紫呀~真厉害我自己审题也不清楚~~谢谢你啦~~

敢问大侠考过GMAT了吗

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