RRB Group-D Model Paper 13 with answers for online practice

Tips & Tricks
Given:
P can complete a work in 60 days
Q can complete the same work in 50 days
Concept:
Time is inversely proportional to efficiency.
Calculation:
Efficiency of P = 1/60
Efficiency of Q = 1/50
Efficiency ratio of P to Q = 1/60 : 1/50
⇒ 50 : 60
⇒ 5 : 6
∴ The ratio of working efficiencies of P and Q is 5 : 6