SOLUTION: a pipe can fill a pool in 9 hours, while a drain can empty it in 15 hours. if the pipe and drain were both opened at 12 noon, then at what time will the pool be filled?

Question 1120279: a pipe can fill a pool in 9 hours, while a drain can empty it in 15 hours. if the pipe and drain were both opened at 12 noon, then at what time will the pool be filled?
Found 2 solutions by josgarithmetic, Shin123:
Answer by josgarithmetic(39620) (Show Source): You can put this solution on YOUR website!

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10:30AM the next day
Answer by Shin123(626) (Show Source): You can put this solution on YOUR website!
The pipe can fill 1/9 of the pool in a hour and the drain can �fill� -1/15 of the pool in a hour.

The pipe and the drain can fill 2/45 of the pool in a hour.
10:30 AM the next day, the pool will be full.
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