SOLUTION: One inlet pipe can fill an empty pool in 8 hours, and a drain can empty the pool in 16 hours. How long will it take the pipe to fill the pool if the drain is left open?

Question 885097: One inlet pipe can fill an empty pool in 8 hours, and a drain can empty the pool in 16 hours. How long will it take the pipe to fill the pool if the drain is left open?
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
Sum of the FILL rates. One pipe fills and the other pipe fills LESS THAN ZERO rate.

x = how long to fill if both pipes are open at the same time

hours
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