Mini and Monu together can complete a work in 24 days. Both of them started the work together, but left after 12 days, and the remaining work was completed by Montu in 16 days. If the efficiency of Mini and Montu is the same, then find the time taken by Monu to complete 23 of the given 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?