Work

A and B can complete (2)/(3) rd of a piece of work , if A work 3 days and B work 4 days together. While they can complete (11)/(12) part of the work.if A work 3 days and B works 6 days together. In how many days A and B will complete the work seperately.

A, B and C can finish a piece of work in 12 days, 15 days and 20 days respectively. They started working together. B left the work after working 3 days and C left the work 3 days before completion of the work. In how many days work will be finished?

To complete a certain work, C working alone takes twice as long as A and B working together. A working alone takes 3 times as long as B and C working together. All the three together can complete the work in 5 days. How long would each take to complete th work individually?