Correct option is D
Total time taken by A to complete the whole work = 8×5/1=40 days
Total time taken by B to complete the whole work = 24 ×5/4=30 days
Let total work = 120 unit (LCM of 40 & 30)
Efficiency of A = 120/40 = 3 unit/day
Efficiency of B = 120/30 = 4 unit/day
Required answer =
