5 men and 4 women can complete a work in 27 days, whereas 7 men and 9 women can do the same work in 15 days. In how many days can 2 men and 5 women complete 111.11% of the same work?

If P and Q together can complete a piece of work in 15 days and P alone can do it in 45 days, in how many days can Q alone complete that work?

A can lay a railway track between two stations in 16 days and B can do the same job in 12 days. With the help of C, they finished the job in 4 days. In how many days can C alone do the job?