A alone can complete a work in 20/3 days. A and B together can complete it in 5 days. How long will B alone take to complete the work?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 20 days.
A alone can complete a work in 20/3 days
A's one day work = 3/20 days
A and B together can complete it in 5 days
(A + B)'s one day work = 1/5 days
Time taken by B = 1/5 - 3/20
⇒ (20 - 15)/100
⇒ 5/100 = 20 days