31. Vijay can chop all the vegetables available in 4 minutes lesser time than Bishaka. If both of them work together, they take 288 seconds to chop all the vegetables. How long does Vijay alone take to chop all the vegetables?
32. A is twice as efficient as B, and they take equal time as the time taken by C and D to do this work together. If C and D can complete the same work in 15 and 20 days respectively, then. In how many days can A alone complete the work?
33. A can do $$\frac{1}{4}$$ part of a work in 9 days. B can do $$\frac{2}{3}$$ part of the same work in 28 days. Working together, in how many days can A and B complete the whole work?
34. Three painters have to spend 6 hours a day for 12 days to finish a work. If after 3 days one painter leaves, in how many days the remaining work will be completed?
35. If one man or two women or four boys or five girls can finish a work in 39 days, then how many days will one man, one woman, one boy and one girl together take to finish the same work?
36. A and B can do a piece of work in 25 days. B alone can do $$66\frac{2}{3}\% $$ of the same work in 30 days. In how many days can A alone do $$\frac{4}{{15}}$$ part of the same work?
37. 25 persons can complete a work in 60 days. They started the work. 10 persons left the work after x days. If the whole work was completed in 80 days, then what is the value of x?
38. Ten men begin to do a work. But after some days, four of them left the job. As a result, the job that could have been completed in 40 days is completed in 50 days. How many days after the commencement of the work did the four men leave?
39. X can do a piece of work in 24 days. When he had worked for 4 days, Y joined him. If complete work was finished in 16 days, Y can alone finish that work in:
40. To do a certain work, A and B work on alternate days, with B beginning the work on the first day. A can finish the work alone in 48 days. If the work gets completed in $$11\frac{1}{3}$$ days, then B alone can finish 4 times the same work in:
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