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Mathematics, 02.07.2020 03:01 umchriis
One inlet pipe can fill an empty pool in 6 hours, and a drain can empty the pool in 12 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 6 hours, and a drain can empty the pool in 12 hours. How lo...
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