List of top Quantitative Aptitude Questions on work Efficiency

5 men or 7 women can do a piece of work in 28 days. Find the time required by 7 men and 5 women to complete the task.
Amal can complete a job in 10 days and Bimal can complete it in 8 days. Amal, Bimal and Kamal together complete the job in 4 days and are paid a total amount of Rs 1000 as remuneration. If this amount is shared by them in proportion to their work, then Kamal's share, in Rupees will be how much?
Amal and Vimal together can complete a task in 150 days, while Vimal and Sunil together can complete the same task in 100 days. Amal starts working on the task and works for 75 days, then Vimal takes over and works for 135 days. Finally, Sunil takes over and completes the remaining task in 45 days. If Amal had started the task alone and worked on all days, Vimal had worked on every second day, and Sunil had worked on every third day, then the number of days required to complete the task would have been how many?
A and B can do a work in 8 days, B and C in 12 days. A, B and C together finish it in 6 days. In how many days will A and C together do it?
A, B and C can do a piece of work in 20, 30 and 60 days respectively. In how many days can A do the work if he is assisted by B and C on every third day?
A and B can do a work in 8 days; B and C in 12 days; A, B and C together in 6 days. In how many days will A and C together do it?

Rajesh can check the quality of 1000 items in 5 hours and Rakesh can complete 75% of the same job in 3 hours. How much time is required for both of them to check 1300 items, if Rakesh stops checking after 2 hours?