# SOLUTION: If a vat of acid can be filled by an inlet pipe in 10 hours and emptied by an outlet pipe in 20 hours, how long will it take to fill the vat if both pipes are open?

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 Click here to see ALL problems on Rate-of-work-word-problems Question 352105: If a vat of acid can be filled by an inlet pipe in 10 hours and emptied by an outlet pipe in 20 hours, how long will it take to fill the vat if both pipes are open?Answer by Fombitz(13828)   (Show Source): You can put this solution on YOUR website!Rate*Time=Output . . . Let the vat volume equal . . . . Fill rate: . . Draining rate: . . With both valves open, Substitute from above, hrs