Quantitative Aptitude Time and Work Pipe and Cistern

Three pipes P, Q and R can fill a tank in 12 hours, 15 hours and 20 hours respectively. If P and R start the work and works for 4 hours, then the rest of the work is completed by Q in what time?

1

8 hours

2

7 hours

3

6 hours

4

5 hours

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