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Mathematics, 23.11.2020 09:40, xxaurorabluexx
One inlet pipe can fill an empty pool in 9 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?
hours
![answer](/tpl/images/cats/otvet.png)
Answers: 3
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One inlet pipe can fill an empty pool in 9 hours, and a drain can empty the pool in 12 hours. How lo...
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