大家看看这道题：
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 repective constant rates and consequently it took T hours to fill the bucket, which of the following must bu true?
1, 0<T<H
2,C<T<H
3,C/2<T<H/2
Answer is 1 and 3, but why 3 is correct??? I'm almost sure that the answer is wrong.
设C=2，H=3，则T=6/5
答案没错，LZ请细心。
got it, Thanks!
t=c/(1+c/h)
c<h
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