SOLUTION: A water tank has an inlet pipe and a drain pipe. A full tank can be emptied in 30 mins if the drain is opened and an empty tank can be filled in 45mins witht he inlet pipe opened.

Question 375608: A water tank has an inlet pipe and a drain pipe. A full tank can be emptied in 30 mins if the drain is opened and an empty tank can be filled in 45mins witht he 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 scott8148(6628) (Show Source): You can put this solution on YOUR website!
in the 30 min that the drain would empty the tank , the inlet refills it 2/3 (30/45) full
___ so the tank is emptying at a rate of 1/3 tank per 30 min
___ 90 minutes to empty
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