The efficiencies of A, B, and C are in the ratio 2 : 5 : 3. Working together, they can complete a task in 9 days. In how many days will C alone complete 40% of that task?

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?