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Mathematics, 10.03.2020 00:12 zairaefh6496

A new type of pump can drain a certain pool in 6 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 6 hours. an older pump can drain the pool in 9 hours....
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