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11 October, 10:21

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 4 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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  1. 11 October, 10:28
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    Let R and r the rate of work of the large and the small pumps respectively
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