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Mathematics, 26.07.2019 00:00 zack66828

One inlet pipe can fill an empty pool in 4 hours, and a drain can empty the pool in 10 hours. how long will it take the pipe to fill the pool if the drain is left open?

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One inlet pipe can fill an empty pool in 4 hours, and a drain can empty the pool in 10 hours. how lo...
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