Babita is 1.25 times as efficient as Deepak. Working together the duo can complete a piece of work in 40 days. In how many days can Deepak alone complete the same piece of work?

Working together A, B and C can complete a certain work in 40 days. B and C together can complete thesame work in 60 days. B is 25% more efficient than A. In how many days will C alone complete 40% ofthe same work?

Pinki, Chinki and Reema started a work and Reema left after 4 days when 46% of the work is completed and then work got completed in 9 more days. In how many days can Reema alone complete the work?

A can lay railway track between two given stations in 20 days and B can do the same job in 12 days. With the help of C, they did the job in 2 days only. Then, C alone can do the job in​

Isha can do a certain piece of work in 24 days. Isha and Smriti can together do the same work in 20 days, and Isha, Smriti and Ashlesha can do the same work together in 12 days. In how many days can Isha and Ashlesha do the same work together?​