Kaberi can do a job in 10 days and arti in 15 days if both work of them they can finish the work in how many days

A can do a piece of work in 10 days, B can do it in 15 days working together they can finish the work in :

A can do a piece of work in 12 days and B in 15 days. With help of C, they finish the work in 4 days. In how many days C alone can do the same work?

A can do a piece of work in 10 days and B in 12 days. With help of C, they finish the work in 4 days. In how many days C along can do the same work?

A can do a piece of work in 5 days, B can do it in 10 days. With the help of C, they finish the work in 2 days. In how many days C alone can do the whole work?

A can do a piece of work in 20 days and B in 15 days. With help of C, they finish the work in 5 days. C can alone do the work in

A can do a job in 10 days, B can do the same job in 12 days and C can do the same job in 15 days. In how many days they will finish the work together?

If A can do a piece of work in p days and B can do the same in q days: A and B together can finish it in how many days