Mathematics, 08.07.2019 17:30 geeez65

It takes an older pump twice as long to drain a certain pool as it does a newer pump. working together, it takes the two pumps 5 hours to drain the pool. how long will it take the newer pump to drain the pool working alone?

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It takes an older pump twice as long to drain a certain pool as it does a newer pump. working togeth...

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