Jagjit, Vinay and Soham can do a work separately in 12, 24, 24 days. When they work together, What is the total number of days required to complete the work?

The strength of Gopal is twice that of Sandeep, whereas the strength of Sandeep is thrice that of Mohit. If Gopal can do the complete work in 5 days, then how many days are required to do the complete work by three of them?

Rahul and Maneesh working separately can do a piece of work in 9 days and 12 days respectively. If they work for a day alternately, Rahul beginning, in how many days, the work will be completed?

Vinay can do a certain work in 16 days. Shubham is 60% more efficient than Vinay. How many days does Shubham alone take to do the same work?

Six men do a piece of work in 10 days with an effort of 6 hours per day. How many extra men are required for doing the work of double strength in 4 days with an effort of 5 hours per day

3 men and 4 women do a work in 10 days as 2 men and 6 women do. 4 men and 8 women starts the same work and after 2 days only women remains in the work for completing it.

How many days are required to complete the work ?