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11. A can lay railway track between two given stations in 16 days and B can do the same job in 12 days. With the help of C, they did the job in 4 days only. Then, C alone can do the job in

12. A takes twice as much time as B or thrice as much time to finish a piece of work. Working together, they can finish the work in 2 days. B can do the work alone in

13. X can do 1/4 of a work in 10 days, Y can do 40% of the work in 40 days and Z can do 1/3 of the work in 13 days. Who will complete the work first?

14. A is twice as good a workman as B and together they finish a piece of work in 18 days.In how many days will A alone finish the work?

15. A can do a certain job in 12 days. B is 60% more efficient than A. How many days does B alone take to do the same job?