SOLUTION: A water tank can be filled by an inlet in 8 hours. It takes twice the long for the outlet pipe to empty the tank. How long will it take to fill the tank if both pipes are open?

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Question 1011609: A water tank can be filled by an inlet in 8 hours. It takes twice the 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(39620) About Me  (Show Source):
You can put this solution on YOUR website!
ONE tank is the main volume unit.

Fill rate is +1/8;
Empty rate is -(1/16);
Combined pipes FILLING rate is highlight%28%281%2F8-1%2F16%29%2A%28TANK%2FHOUR%29%29.

1%2F8-1%2F16
2%2F16-1%2F16
1%2F16-------------1 tank filled in 16 hours.