A, B, and C undertake to complete a piece of work for Rs. 707. A and B together complete 57 of the work, and the remaining work is done by C alone. How much share of the wages (in Rs.) should C receive?

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?