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

A can do a piece of work in 10 days while B alone can do it in 15 days . In how many days can both finish the same work?

A and B together can do a job in 12 days. B alone can finish it in 28 days. In how many days can A alone finish the work? (a)21 days (b)19 days (c)20 days (d)none of these

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, while B alone can finish it in 30 days. A alone can finish the work in