AFCAT II 2020 Solved Paper

Let total work done by P,Q and R=100 unit,
Work done by P and Q=100×70∕100=70
Remaining work done by R=100−70=30
Work done by Q and R=100×50∕100=50
Remaining work done by P=50
Work done by Q=70−50=20
Efficiency of P=50, Efficiency of Q=20 and
Efficiency of R=30
Now, we can say P will finish first, If they work alone.