October 10, 2015

Homework Help: math

Posted by brian on Sunday, July 10, 2011 at 10:45pm.

An inlet pipe on a swimming pool can be used to fill the pool in 28 hours. The drain pipe can be used to empty the pool in 42 hours. If the pool is one-third filled and then the drain pipe is accidentally opened, how long will it take to fill the pool?

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