SOLUTION: To fill a swimming pool requires 4 hours if water enters through an inlet pipe​ alone, or 7 hours if water enters through a hose alone. An outlet pipe can drain the pool in

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Question 1020668: To fill a swimming pool requires 4 hours if water enters through an inlet pipe​ alone, or 7 hours if water enters through a hose alone. An outlet pipe can drain the pool in 9 hours. If the inlet​ pipe, hose, and outlet pipe are all being used​ simultaneously, how long will it take to fill the​ pool?
Answer by josgarithmetic(39617)   (Show Source): You can put this solution on YOUR website!
Reciprocal of the sum of the individual rates. 

PIPE         RATE

inlet        

hose         

outlet

All pipes working simultaneously, the rate in POOLS per HOUR is .

First step is .

Next step can be .
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