Mathematics, 08.10.2020 06:01, stressedmolly632

A new type of pump can drain a certain pool in 3 hours. An older pump can drain the pool in 9 hours. How long will it take both pumps working together to drain the pool?

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A new type of pump can drain a certain pool in 3 hours. An older pump can drain the pool in 9 hours....

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