## Thursday, 15 December 2011

### CBSE VIII Maths Time and work

1. A can do piece of work in 30 days while B alone can do it in 40 days. In how many days can A and B working together do it? Ans 17 1/7
2. A and B together can complete a piece of work in 35 days while A alone can complete the same work in 60 days. B alone will be able to complete the same working in ans 84 days
3. A can do a piece of work in 7days of 9 horse each and B can do it in 6 days of 7 hours each. How long will they take to do it, working together 8 2/5 hours a day ? ans 3 days
4. A can do a piece of work in 15 days and B alone can do it in 10 days. B works at it for 5 days and them leaves. A alone can finish the remaining in ans : 7 1/ 2 days
5. A can do 1/3 of the work in 5 days and B can do 2/5 of the work in 10 days in how many days both A and B together can do the wrok ans 9 3/8
6. A can do a piece of work in 80 days. He works at it for 10 days and then B alone finished the remaining work in 42 days. The two together could complete the work in : ans 30 days
7. A and B can together finish a work in 30 days. They worked at it for 20 days and then B left. The remaining work was done by A alone in 20 more days A alone can finish the work in ans : 60 days
8. A and B can do a piece of work in 45 days and 40 days respectively. They began to go the work together but A leaves after some days and than B completed the reaminnig work in 23 days. The number o days after which A left the work was ans: 9
9. A does half as much work as B in three fourth of the time. If together they take 18 days to complete the work, how much time shall B take to do it ?ans 30 days
10. A can do a certain job in 12 days. B is 60% more efficient than A . The number of days, it takes B to do the same piece of work is ans 7 ½
11. A can do a certain job in 25 days which B alone can do in 20 days. A stared the work and was joined by B after 10 days. The number days taken in completing the work was ans 16 2/3
12. A is twice as good a work man as B and together they finish a piece of work in 14 days The number of days taken by A alone to finish the work. Ans: 21 days
13. A is thrice as good a workman as B and takes 10 days less to do a piece of work than B takes.B alone can do the while work work in : ans 15 days
14. A can do a piece work in 14 days which B can do in 21 days. They being together but 3 days the completion of the work. A leaves of the total number of days to complete the work is ans 10 1/5
15. If Ramesh, suresh and harish can do a piece of work in 15 days, 10 days and 6 days resp. How long will they take to do it, if all the three work it together. ? ans 3 days
16. A and B can do a piece of working 72 days : B and C and do it in 120 days ; A and C can do it in 90 days. In what time can A alone do it ? ans 120 days
17. A and B and C together can finish a piece of work in 4 days: alone can do it in 12 days and B in 18 days, then C alone can do it in : ans 9 days
18. If A and B C together can finish a piece of work in 4 days”:
19. A and B can do a piece of work in 18 days: B and C can do it in 24 days : A and C can do it in 36 days. In
20. If A and B C together can finish a piece of work in 18 days” B and C can do it in 24 days: A and C do it in 36 days after A has been working it for 5 days for days C finished in 13 days. In how many days C alone will do the work ans : 24
21. A is twice as good as workman as B and together they complete a work in 15 days . in how many days can the work be complete by B alone ans 45
22. 45 men can complete a wok in 16 days. Six days after they started working 30 more men joined them. How many days will they now take to complete the remaining work? Ans 6
23. 12 men can complete a work in 18 days six days after they started working men joined them. How many days will all of them together complete the remaining work? Ans 9
24. Twelve men can complete a work in 8 days. Three days after started the work 3 more men joined. In how many days will all of them together complete the remaining work ans 4
25. A,B and C are employed to do a piece of work for Rs.529. A and C are supposed to finish 19/23 of the work together. How much shall be paid to B? Ans 9
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