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 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 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 10 days, B and C in 15 days and C and A in 20 days. C alone can do the work in :

A and B can do piece of work in 12 days; B and C in 15 days; C and A in 20 days. In how many days will they finish it together and separately ?

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 can do a piece of work in 16 days and B can do the same work in 20 days.In how many days can they do the same work,working together?