A can complete a piece of work working along with B in 20 days. If he can complete the same work working along with C in 10 days, then between B and C who is more efficient ?

A B and C can complete a piece of work in 24, 6 and 12 days respectively. They will complete the same work in :

A and B together can complete a piece of work in 4 days. If A alone can complete the same work in 12 days, in how many days can B alone complete that work ?

A, B and C can complete a piece of work in 10, 20 and 60 days respectively. Working together they can complete the same work in how many days?

A alone can complete a piece of work in 6 days and B alone can complete the same piece of work in 12 days. In how many days can A and B together complete the same piece of work ?