document.write( "Question 838083: A water tank can be filled by an inlet pipe in 6 hours. It takes 3 times as long for the outlet pipe to empty the tank. How long will it take to fill the tank if both pipes are open?
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Algebra.Com's Answer #513520 by richwmiller(17219)\"\" \"About 
You can put this solution on YOUR website!
1/6-1/18=1/x
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