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April 18, 2014

Homework Help: algebra

Posted by luckybee on Friday, June 29, 2012 at 9:09pm.

a tank used to operate equipment can be filled with air in 3 hours. when the outlet valve is open, the same tank can be emptied in 5 hours. if the tank is filled with the outlet valve open approximately how long will it take to fill the tank? 71/2 hours. Is this correct

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