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[GMAT数学题讨论] 07prep-ps2第68题

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icetong123 发表于 2014-9-9 17:43:08 | 显示全部楼层 |阅读模式
68. In a certain bathtub, both the cold-water and the hot-water fixtures leak. The cold-water leak alone would fill an empty bucket in c hours, and the hot-water leak alone would fill the same bucket in h hours, where c < h. If both fixtures began to leak at the same time into the empty bucket at their respective constant rates and consequently it took t hours to fill the bucket, which of the following must be true?
   
I. 0<t<h
II. c<t<h
III . c/2<t<h/2
(A) I only
(B) II only
(C) III only
(D) I and II
(E) I and III
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Anthear 发表于 2016-8-31 23:58:57 来自手机 | 显示全部楼层
Thanks a lot
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