Question

A can do a piece of work in 12 days and B can do it in 18 days. They work together for 2 days and then A leaves. How long will B take to finish the remaining work ? 

(a) 6 days 

(b) 8 days 

(c) 10 days 

(d) 13 days

Answer 1

Correct option (d) 13 days

Explanation: 

work done by A and B in 2 days 

(3+2)×2=5 units/day × 2 = 10 units. 

work left : 36 – 10 =26 units and it will be complete by ‘B’ alone