Correct option is D
Given:
M and N together can complete the work in 40 days
M is 50% more efficient than N
Work = 1 unit
Formula Used:
Work = Efficiency × Time
Solution:
If M is 50% more efficient than N, then
Efficiency of M : Efficiency of N = 3 : 2
Together efficiency of M and N = 3 + 2 = 5 units
Time taken together = 40 days
Total work = 40 × 5 = 200 units
M’s efficiency = 3 units per day
So,