# SOLUTION: A certain tank can be filled by pipe A in 12 minutes. Pipe B can empty the tank in 18 minutes. If both pipes are open, how long will it take to fill or empty the tank?

Algebra ->  Algebra  -> Rate-of-work-word-problems -> SOLUTION: A certain tank can be filled by pipe A in 12 minutes. Pipe B can empty the tank in 18 minutes. If both pipes are open, how long will it take to fill or empty the tank?      Log On

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 Click here to see ALL problems on Rate-of-work-word-problems Question 522778: A certain tank can be filled by pipe A in 12 minutes. Pipe B can empty the tank in 18 minutes. If both pipes are open, how long will it take to fill or empty the tank?Answer by ankor@dixie-net.com(15649)   (Show Source): You can put this solution on YOUR website!A certain tank can be filled by pipe A in 12 minutes. Pipe B can empty the tank in 18 minutes. If both pipes are open, how long will it take to fill or empty the tank? : It takes less time to fill it than to empty it, therefore with both valves open the tank will be filled eventually : Let t = time to fill the tank with both valves open Let a full tank = 1 - = 1 multiply by 36 36* - 36* = 36(1) Cancel the denominators, results 3t - 2t = 36 t = 36 hrs to fill the tank with both valves left open