Question

A' can do a piece of work in 12 days. When he had worked on it for 2 days 'b' joins him. If the complete work was finished in 8 days. In how many days 'b' alone could finish the work?

Answer 1

A can do in 12 days 1 part of work.

So, A can do in 1 day 1/12 part of work.

A had done in 2 days ((1/12) * 2) =1/6 part of work.

Remaining work = (1- 1/6) = 5/6 part.

B finishes the remaining work in (8-2)= 6 days.

So, B do 5/6 part of work in 6 days.

B can do 1 part of work in (6÷(5/6)) = 36/5 =7.2 days.