Time and Work
Time and Work - Important Points
| 26. | 12 men can complete a work in 9 days. After they have worked for 6 days, 6 more men joined. Number of days they will take to complete the remaining work: |
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A. 2 days
B. 3 days
C. 4 days
D. 5 days
View Answer Discuss Work SpaceAnswer: option a
Explanation:
Total work = 12 x 9 = 108 men-days
Work done = 12 x 6 = 72 men-days
Work left = 108 - 72 = 36 men-days
Time to complete remaining work = 36/18 = 2 days
| 27. | 7 men undertook a work to be completed in 12 days. They started the work and after 5 days, two men left. The remaining work will now be completed in: |
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A. 6
B. 7
C. 8
D. None of these
View Answer Discuss Work SpaceAnswer: option d
Explanation:
Total work = 7 x 12 = 84 men-days
Work done = 7 x 5 = 35 men-days
Work left = 84 - 35 = 49 men-days
Time to complete remaining work = 49/5 = 9 4/5 days
| 28. | A contractor employed 30 men to do a work in 38 days. After 25 days, he employed 5 more men, and the work was completed one day before the schedule. How many days he would have been behind the schedule,if he had not employed additional men? |
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A. 13/7 days
B. 8/7 days
C. 2 days
D. 3/2 days
View Answer Discuss Work SpaceAnswer: option a
Explanation:
Total work = 30 x 38 = 1140 men-days
Work done in 25 days = 30 x 25 = 750 men-days
Work left = 1140 - 750 = 390 men-days
Time to complete remaining work with 5 more men = 390/35 = 11 1/7 days
Time to complete remaining work without 5 more men = 390/30 = 13 days
Difference = 1 6/7 days
| 29. | 10 women can complete a work in 8 days and 10 children take 12 days to complete the same work. Then, 6 women and 3 children together can complete the work in: |
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A. 9 days
B. 10 days
C. 11 days
D. 12 days
View Answer Discuss Work SpaceAnswer: option b
Explanation:
Total work = 10 x 8 = 80 women-days OR 10 x 12 = 120 child-days
=> 1 women-day = 1.5 child-day
So, 6 women and 3 child <=> 12 child
Time to complete the work = 120/12 = 10 days
| 30. | 10 women can complete a piece of work in 7 days and 10 children take 14 days to complete the same work. How many days will 5 women and 10 children take to complete the work? |
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A. 6 days
B. 7 days
C. 8 days
D. 9 days
View Answer Discuss Work SpaceAnswer: option b
Explanation:
Total work = 10 x 7 = 70 women-days OR 10 x 14 = 140 child-days
=> 1 women-day = 2 child-day
So, 5 women and 10 child <=> 20 child
Time to complete the work = 140/20 = 7 days
Time and Work Questions and Answers FAQ
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