RRB Group-D Model Paper 16 with answers for online practice

Given:
Efficiency ratio of A and B is = 3 : 4
A alone can compete a work in = 20 days
Formula:
Total work = Efficiency × Time
Calculation:
Let A does 3 units of work and B does 4 units of work.
Total work = 3 × 20 = 60 unit
∴ Time taken by B to finish the whole work = 60/4 = 15 days