Rajan can do a piece of work in 24 days while Amit can do it in 30 days. In how many days can they complete it they work together?

A can do a piece of work in 14 days while B can do it in 21 days. In how many days, working together they will complete the whole work?

A can do a piece of work in 14 days while B can do it in 28 days. In how many days, working together will they complete the whole work?

A can do a piece of work in 4 days and B can do it in 12 days. In how many days will they finish the work, both working together ?

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 9 days and B can do the same in 12 days. In how days can the work be completed if A and B work together?

A can do a piece of work in 8 days, B can do it in 16 days, while C can do it in 80 days. In how many days they can complete the whole work, working together?