Quantitative Aptitude Time and Work Pipe and Cistern

Pipe P & Pipe Q can fill a tank in 5 hours and 15 hours respectively. R can empty the same tank in 7.5 hours. How much time will all the three take together to fill the same tank?

1

2.5 hours

2

12.5 hours

3

3.5 hours

4

7.5 hours

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