A can do a work in 12 days and B is 60% more efficient than A. Tell B.

A can do a piece ofwork in 14 days and B is 40% more efficient than A.In how many days can B finish it?

A can do a certain job in 12 days. B is 60% more efficient than A. To do the same job B alone would take?

A can do a piece of work in 24 days. If B is 60% more efficient than A, then the number of days required by B to do the same piece of work is :