February 22, 2017

Homework Help: math

Posted by jannaline inguito on Wednesday, September 14, 2011 at 7:39am.

A tank fitted with two pipes is to filled with water. One pipe can fill it in 5 hours. After it has been open for 3 hours, the second pipe is opened and the tank is filled in 4 hours more. How long it would take the second pipe alone to fill the tank?

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