Question

A and B together can do a piece of work in 12 days. While B alone can finish it in 30 days. A alone can finish the work in: 

(a) 20 days 

(b) 25 days 

(c) 15 days 

(d) 18 days

Answer 1

Correct option (a) 20 days

Explanation:

(A+B)’s, one day work is 5 units

B’s one day work is 2 units

So, A one day work is = 5 – 2 = 3 units 

A will complete the whole work in

= 60/3 = 20 days