Two Pipes Are Used To Fill A Pool. One Pipe Can Fill The Pool In 3 Hours While The Other Pipe Can Fill The Pool In 6 Hours. The Drain, Which Can Empty

Two pipes are used to fill a pool. One pipe can fill the pool in 3 hours while the other pipe can fill the pool in 6 hours. The drain, which can empty the pool in 8 hours, was accidentally left open. How long will it take the pool to fill completely?

 

Answer: 9 hrs

Step-by-step explanation:


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