SOLUTION: one inlet pipe can fill an empty pool in 4 hours, and a drain can empty the pool in 8 hours. how long will it take the pipe to fill the pool if the drain is left open?

Question 287943: one inlet pipe can fill an empty pool in 4 hours, and a drain can empty the pool in 8 hours. how long will it take the pipe to fill the pool if the drain is left open?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
one inlet pipe can fill an empty pool in 4 hours, and a drain can empty the pool in 8 hours. how long will it take the pipe to fill the pool if the drain is left open?
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Each hour, 1/4 of the pool is filled and 1/8 is emptied.
--> each hour, the change = 1/4 - 1/8 = 1/8
8 hours

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