Working efficiencies of P and Q for completing a piece of working are in the ratio 3 : 4. The number of days to be taken by them to complete the work will be in the ratio ?

A. 3 : 2

B. 2 : 3

C. 3 : 4

D. 4 : 3

Answer: Option D

Solution(By Examveda Team)

Since we know efficiency and time are inversely proportion to each other.
$$\eqalign{ & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\text{P}}:{\text{Q}} \cr & {\text{Efficiency}}\,\,\,3:4 \cr & {\text{Time}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,4:3 \cr} $$