railway RRB JE (CBT I + CBT II) Mock Test 2024 Quantitative Aptitude Time and Work Work Efficiency

P can do some work in 4 hours. Q and R together can finish it in 3 hours while P and R can do it in 2 hours. How long will Q take to complete it, if he works alone?

1
8 hours
2
10 hours
3
12 hours
4
15 hours
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