1. A and B together can finish a work in 15 days. If If A alone can finish this work in 24 days, B alone can do this work In how many days?

X and Y together can finish a piece of work in 15 days, while Y alone can finish it in 40 days. X alone can finish the work in:

A and B together can finish a piece of work in 12 days. If 'A' alone can finish the same work in 20 days, how many days B alone can finish it ?

A and B together can do a piece of work in 12 days, while B alone can finish it in 30 days. A alone can finish the work in

A and B together can do a work in 30 days and A alone can do it in 40 days. In how many days B alone can do this?