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41. A man can do a piece of work in 5 days, but with the help of his son, he can do it in 3 days. In what time can the son do it alone?

42. A man can do a job in 15 days. His father takes 20 days and his son finishes it in 25 days. How long will they take to complete the job if they all work together?

43. A,B and C can complete a piece of work in 24,6 and 12 days respectively. Working together, they will complete the same work in

44. A Tyre has two punctures. The first puncture alone would have made the Tyre flat in 9 minutes and the second alone would have done it in 6 minutes.If air leaks out at a constant rate, how long does it take both the punctures together to make it flat?

45. A can finish a work in 18 days days and B can do the same work in half the time taken by A. Then,working together, what part of the same work they can finish in a day?