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Mathematics, 24.07.2019 09:00 jayycruz59

Anew type of pump can drain a certain pool in 7 hours. an older pump can drain the pool in 13 hours. how long will it take both pumps working together to drain the pool?

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Anew type of pump can drain a certain pool in 7 hours. an older pump can drain the pool in 13 hours....
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