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标题: 求助GWD29-16 [打印本页]

作者: 卡通猫王 时间: 2006-5-17 06:56 标题: 求助GWD29-16

Q16:

On a certain nonstop trip, Marta averaged x miles per hour for 2 hours and y miles per hour for the remaining 3 hours. What was her average speed, in miles per hour, for the entire trip?

(1) 2x + 3y = 280

(2) y = x + 10

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.

正确答案是A,可我觉得是C,请教各位NN!!

作者: liuliyun 时间: 2006-5-17 13:12

（1）就足够充分了，总路程280，总时间5小时。平均速度280/5

作者: poorleafs 时间: 2006-5-18 21:58

agree!!!!!!!!!!!

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