# SOLUTION: a water tank has an inlet pipe and a drain pipe. a full tank ca be emptied in 30 minuetes if the drain is opened and an empty tank can be filled in 45 min. with the inlet pipe open

Algebra ->  Algebra  -> Rate-of-work-word-problems -> SOLUTION: a water tank has an inlet pipe and a drain pipe. a full tank ca be emptied in 30 minuetes if the drain is opened and an empty tank can be filled in 45 min. with the inlet pipe open      Log On

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 Click here to see ALL problems on Rate-of-work-word-problems Question 175692: a water tank has an inlet pipe and a drain pipe. a full tank ca be emptied in 30 minuetes if the drain is opened and an empty tank can be filled in 45 min. with the inlet pipe opened. if both pipes are accidentally opened when the tank is full, then how long will it take to empty the tank?Answer by ankor@dixie-net.com(15646)   (Show Source): You can put this solution on YOUR website!a water tank has an inlet pipe and a drain pipe. a full tank can be emptied in 30 minutes if the drain is opened and an empty tank can be filled in 45 min. with the inlet pipe opened. if both pipes are accidentally opened when the tank is full, then how long will it take to empty the tank? : Let t = time required to empty the tank with both valves open : Let the empty tank = 1 : In this case emptying is +, and filling is - : - = 1 Multiply equation by 90 3t - 2t = 90 : t = 90 min to empty with both valves open : : Check solution: 90/30 - 90/45 3 - 2 = 1