This is a common problem, I think
Two large and 1 small pumps can fill a swimming pool in 4 hours. One large and 3 small pumps can also fill the same swimming pool in 4 hours. How many hours will it take 4 large and 2 small pumps to fill the swimming pool.(We assume that all large pumps are similar and all small pumps are also similar.)
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Two large and one small pump fills the pool in 4 hours. Therefore, if there are 4 large and 2 small pumps (2 times as much as used to fill the pool in 4 hours), it will fill the pool twice as fast, making the time 2 hours...