# SOLUTION: The fill pipe for a tank can fill the tank in 4 hours, and the drain pipe can drain it in 2 hours. If both pipes are accidentally opened, how long will it take to empty a half-fill

Algebra ->  Algebra  -> Rate-of-work-word-problems -> SOLUTION: The fill pipe for a tank can fill the tank in 4 hours, and the drain pipe can drain it in 2 hours. If both pipes are accidentally opened, how long will it take to empty a half-fill      Log On

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 Click here to see ALL problems on Rate-of-work-word-problems Question 489531: The fill pipe for a tank can fill the tank in 4 hours, and the drain pipe can drain it in 2 hours. If both pipes are accidentally opened, how long will it take to empty a half-filled tank?Answer by ankor@dixie-net.com(15646)   (Show Source): You can put this solution on YOUR website!The fill pipe for a tank can fill the tank in 4 hours, and the drain pipe can drain it in 2 hours. If both pipes are accidentally opened, how long will it take to empty a half-filled tank? : Let t = time to empty the tank with both valves open Let an empty tank = 1 then a half empty tank = .5 : - = .5 multiply 4, results: 2t - t = 4(.5) t = 2 hrs to empty the tank