A can do a work in 4 days, B in 5 days and C in 10 days. Find the time taken by A, B and C to do the work together.

A and B can do a piece of work in 18 days. B and C in 24 days, C and A in 36 days. Find the time in whichA, Band C working together can finish the work.

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 work in 8 days, B and C in 12 days, and A and C in 16 days. In what time can they do it, all working together ?

A and B can do a piece of work in 3 days. B and C can do the same workin 9days, while C and A can do it in 12 days. Find the time in which A, B and C can finish the work, working together.

A and B can do a work in 12 days, B and C in 15 days, C and A in 20 days. If A, B and C Work together, they will complete the work in :