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Mathematics, 18.09.2019 20:30 madiiiiiii69
One inlet pipe can fill an empty pool in 9 hours, and a drain can empty the pool in 15 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 9 hours, and a drain can empty the pool in 15 hours. how lo...
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