Working together, X and Y can do a piece of work in 12 days, Y and Z can do it in 15 days where as X and Z can do it in 20 days. Who is the most effcient?

A and B together can do a piece of work in 10 days, B and C together can do it in 15 days while C and A together can do it in 20 days. Together they will complete the work in:

X and Y can do a piece of work in 72 days. Y and Z can do it in 120 days. X and Z can do it in 90 days. In how many days all the three together can do the work ? A)100 days B)150 days C)60 days D) 80 days

A and B together can do a piece of work in 12 days and A alone can do it in 18 days. In how many days canBalone do it?

A and B together can do a piece of work in 12 days; B and C can do it in 20 days while C and A can do it in 15 days. A, B and C all working together can do it in

A can do a piece of work in 10 days, B can do it in 12 days and C can do it in 15 days. In how many days they can complete the work, working together?