Time and Work Questions

A can do a work in 12 days while B can do it in 15 days. They undertake to complete it together for Rs. 450. what will be the share of A in this amount of money ?

P and Q can do a project in 20 and 12 days respectively. In how many days can they complete 40% of the project if they work together?

P and Q can complete a task in 50 and 20 days respectively. In how many days can they complete 70% of the task if they work together?

If 15 persons can do a job in 30 days, then 30 persons with twice the efficiency can do the same job in how many days?

10 persons can do a job in X days. If 20 persons with twice the efficiency can do the same job in 5 days, then find the value of X?

Working 5 hours a day, Shivam can read a book in 24 days. How many hours a day should he work so as to finish the same work in 8 days?

A and B can together do a piece of work in 6 days and A alone can do it in 9 days. The number of days B will take to do it alone is

A can do a work in 16 days and B in 20 days. If they work on it together for 8 days, then what fraction of work is left?