Posted by **NEED HELP NOW!!** on Friday, February 22, 2013 at 6:41pm.

The first of three pipes fills a tank in 12 minutes and a second pipe in 10 minutes.If both these pipes and also a third pipe are open, the tank is filled in 4 minutes. How many minute will the third pipe alone require to fill the tank?

Just need an equation.

Thank you!

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