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April 25, 2014

Homework Help: math

Posted by sam on Tuesday, December 4, 2012 at 2:05pm.

One pipe fills a storage pool in 20 hours. A second pipe fills the same pool in 15 hours. when a third pipe is added and all three are used to fill the pool , it takes only 6 hours. Find how long it takes the third pipe todo the job.

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