An inlet pipe on a swimming pool can be used to fill the pool in 30 hours. The drain pipe can be used to empty the pool in 34 hours. If the pool is 15 filled and then the inlet pipe and drain pipe are opened, how many more hours would it take to fill the pool? Round your answer to two decimal places, if needed.

Step-by-step explanation:

The filling speed is 30 hours or:

The draining speed is 34 hours or:

If both lines are open simultaneously, the filling speed is:

If the tank is 1/5 full, then we need to fill the 4/5 of level and it will take:

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