A can finish a piece of work in 12 hours while B can finish it in 15 hours. How long will both take to finish it, working together?

Ravi can do a piece of work in 15 hours while Raman can do it in 12 hours. How long will both take to do it, woking together?

A and B can finish a piece of work in 12 days, B and C in 15 days shile C and A in 20 days. How long will they take to finish it together ? How long will each take to finish the work alone ?

A can do a piece of work in 10 days and B in 15 days. How long will they take to finish it working together ?

A can do a piece of work in 8 hours while B aline can do it in 12 hours. Both A and B working together can finish the work in time ?

A can do a piece of work in 10 days and B can do the same work in 12 days. How long will they take to finish the work, if both work together?

A, B and C can do a piece of work in10 days, 12 days and 15 days respectively. How long will they take to finish it if they work together?

A and B working together can finish a piece of work in 6 days, while A alone can do it in 9 days. How much time will B alone take to finish it?

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 can do a piece of work in 24 hours while B alone can do it in 16 hours. If A, B and C working together can finish in 8 hours, in how many hours will C alone do the work?