Rakesh can do a piece of work in 20 days. How much work can he do in 4 days.

Rohan can paint of a painting in 6 days. How many days will he take to complete painting?

Anil can do a piece of work in 5 days and Ankur in 4 days. How long will they will do the same work, if they work together?

Mohan takes 9 hours to mow a large lawn. He and Sohan together can mow in4 hours. How long will Sohan take to mow the lawn if he works alone?

Sita can finish typing a 100 page document in 9 hours, Mita in 6 hours and Rita in 12 hours. How long will they take to type a 100 page document if they work together?

A, B and C working together can do a piece of work in 8 hours. A alone can do it in20 hours and B alone can do it in 24 hours. In how many hours will C alone do the same work?

A and B can do a piece of work in 18 days, B and C in 24 days and A and C in 36 days. In what time can they do it, all working together?

A and B can do a piece of work in 12 days; B and C in 15 days; C and A in 20 days. How much time will A alone take to finish the work?

A, B and C can reap a field in days; B, C and D in 14 days; C, D and A in 18 days; D, A and B in 21 days. In what time can A, B, C and D together reap it?

A and B can polish the floors of a building in 10 days. A alone can do th of it in 12 days. In how many days can B alone polish the floor?