Quantitative Aptitude Time and Work Pipe and Cistern

A tank can be filled by tap P in 6 hours, Q in 8 hours and tap R can empty the full tank in 12 hours. If all three taps are opened simultaneously, how long will it take to fill the tank completely?

1

25/6 hours

2

24/5 hours

3

15/6 hours

4

20/3 hours

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