SOLUTION: A water tank can be filled by an inlet pipe in 6 hours. It takes 4 times as long for the outlet pipe to empty the tank. How long will it take to fill the tank if both pipes are ope

Question 900180: A water tank can be filled by an inlet pipe in 6 hours. It takes 4 times as long for the outlet pipe to empty the tank. How long will it take to fill the tank if both pipes are open?
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
The description means that the fill rate for inlet pipe is 1/6 tanks per hour and the FILL rate for the OUTLET pipe is tanks per hour.

If both pipes are open at the same time, then the filling rate is:
----tanks per hour--------Do the arithmetic.
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