A and B can do a work in 10 days, B and C can do a work in 15 days and C and A can do a work in 20 days.

A and B can do a work in 12 days, Band C can do the same work in 15 days, C and A can do the same work in 20 days. The time taken by A, B and C to do the same work is

A and B can do a piece of work in 72 days B and C can do it in 120 days. A and C can do it in 90 days. In how many days, all the three together can do the work?

A and B can do a piece of work in 10 days.B and C can do it in 12 days. A and C can do it in 15 days. How long will A take to do it alone?