railway RPF Constable Mock Test Series 2024 Quantitative Aptitude Time and Work Work Efficiency

P can fill a tank in 5 hours. Q can fill the same tank in 10 hours. R can empty the same tank in 20 hours. How much time will all the three take together to fill the same tank?

1

10 hours

2

4 hours

3

6 hours

4

5 hours

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