P and Q together can do a work in 12 days. P alone can do the same work in 36 days. In how many days can Q alone complete two-third part of the same work?

Answer: Option A

Solution

Answer: Option A

Solution:

Efficiency of Q = 2
So, required answer = $$\frac{36\times \frac{2}{3}}{2}$$  = 12 days