A and B can do a work in 45 days, B and C in 36 days and A and C in 60 days. In how many days can A,B and C individually do the work?

A and B can do a piece of work in 12 days, B and C in 15 days and A and C in 20 days. In how many days can each alone do the work?

A and B can do a piece of work in 12 days, B and C in 15 days C and A in 20 days. In how many days can C alone do it ?

A and B can do a piece of work in 12 days, B and C in 15 days and C and A in 20 days. In how many days can they do it, all working together?

A and B can do a piece of work in 12 days, B and C in 15 days and C and A in 20 days. In how many days can they do it, all working together?

A can do a piece of work in 24 days, A and B can do it in 16 days and A,B and C in 10(2)/(3) days. In how many days can A and C do it working together ?

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 ?