SOLUTION: If an inlet pipe fills a swimming pool in 9 hours and an outlet pipe empties a pool in 12 hours, how long will it take for the pool to fill?
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Question 807038: If an inlet pipe fills a swimming pool in 9 hours and an outlet pipe empties a pool in 12 hours, how long will it take for the pool to fill?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
If one pipe/tap/faucet fills a pool/tank/basin/whatever in 
hours, and another pipe/drain/whatever empties it in 
hours, then the fill pipe fills 
of the pool in one hour and the drain empties 
of the pool in one hour. Working together (or in this case against one another) the pool fills (if positive) or empties (if negative) at a rate of 
of the pool per hour. Do the arithmetic and then take the reciprocal to find the total time.
John
Egw to Beta kai to Sigma
My calculator said it, I believe it, that settles it
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