Freshers India

A is 30% more efficient than B. How much time will they, working together, take to complete a job which A alone could have done in 23 days?                        

A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is                        

Ravi and Kumar are working on an assignment. Ravi takes 6 hours to type 32 pages on a computer, while Kumar takes 5 hours to type 40 pages. How much time will they take, working together on two different computers to type an assignment of 110 pages?                        

A and B together can complete a piece of work in 4 days. If A alone can complete the same work in 12 days. in how many days can b alone complete that work?                        

A, B and C can complete a piece of work in 24, 6 and 12 days respectively. Working together, they will complete the same work in:                        

A and B together can do a piece of work in 30 days.A having worked for 16 days, B finishes the remaining work in 44 days. In how many days shall B finish the whole work alone?