Two pipes can fill a tank in 15 hours an...

Two pipes can fill a tank in 15 hours and 4 hours, respectively , while a third pipe can empty it in 12 hours. How long (in hours) will it take to fill the empty if all the three pipes are opened simultaneously?

`(30)/(7)`

`(20)/(7)`

`(50)/(7)`

`(15)/(7)`

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