SOLUTION: An inlet pipe on a swimming pool can be used to fill the pool in 26 hours. The drain pipe can be used to empty the pool in 30 hours. If the pool is 1/5 filled and then the inlet pi

Algebra ->  Rate-of-work-word-problems -> SOLUTION: An inlet pipe on a swimming pool can be used to fill the pool in 26 hours. The drain pipe can be used to empty the pool in 30 hours. If the pool is 1/5 filled and then the inlet pi      Log On


   

Question 1155718: An inlet pipe on a swimming pool can be used to fill the pool in 26 hours. The drain pipe can be used to empty the pool in 30 hours. If the pool is 1/5 filled and then the inlet pipe and drain pipe are opened, how long from that time will it take to fill the pool?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
If 1/5 of pool is filled, the still need the combined pipes to fill 4/5 of the pool.

%281%2F26-1%2F30%29x=4%2F5; solve for x, the time to do this.
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x=156