弱弱的问下有关工作问题的题~~

qwbbjg · 发表于 2011-3-11 20:41:20

Two water pumps, working simultaneously at their respective constant rates, took exactly 4 hours to fill a certain swimming pool.If the constant rate of one pump was 1.5 times the constant rate of the other, how many hours would it have taken the faster pump to fill the pool if it had worked alone at its constant rate?

(A) 5

(B) 16/3
(C) 11//2
(D) 6

(E) 20/3

prep上的题~数学很烂~一遇到这种题我就不会~~~希望有NN给我讲解一下~要是遇到类似的该怎么做呢~谢谢啦~

sdcar2010 · 发表于 2011-3-11 21:42:17

work done = rate(or speed) * time

弱弱的问下有关工作问题的题~~

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