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Two large and 1 small pump 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?

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Answer: It will take just 1 hour & 36 minutes with 4 large pumps & 4 small pumps

Explanation:

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