A takes as long to do a piece of work ,as B takes.A & B together can finish a piece of work in 15 days .A alone can do it in-

A takes as long to do a piece of work ,as B takes.A & B together can finish a piece of work in 15 days .A alone can do it in-

A 15 days

B 25 days

C 45 days

D 60 days

Solution

Correct Answer: Option D