Time and Work
Time and Work - Important Points
| 21. | A is 50% as efficient as B. C is half as efficient as A and B together. If C alone does the work in 40 days, then A ,B and C together can complete the work in: |
|---|
A. 13 1/3 days
B. 15 days
C. 16 2/3 days
D. 20 days
View Answer Discuss Work SpaceAnswer: option a
Explanation:
If B does 4 unit/day, then, A does 2 unit/day and C does 3 unit/day.
Total work = 40 x 3 = 120 unit
Working together, they can do it in 120/9 = 40/3 days.
| 22. | After working for 6 days, Abhi finds that only 1/3 rd of the work has been done. He employs Biswas who is 60% as efficient as Abhi. How many days more would Biswas take to complete the work? |
|---|
A. 18 days
B. 19 days
C. 20 days
D. 21 days
View Answer Discuss Work SpaceAnswer: option c
Explanation:
Abhi does the work in 6 x 3 = 18 days
Biswas does it in 18/(0.6) = 30 days
Let total work is 90.
Biswas does 3 unit/day and Abhi 5 unit/day.
Abhi has done 30 unit in 6 days and 60 unit is left.
Biswas will complete it in 60/3 = 20 days
| 23. | Akhil and Bishnu working together completed a job in 5 days. If Akhil worked with twice of his efficiency and Bishnu worked with 1/3 rd of his efficiency, the work would have been completed in 3 days. Akhil alone could complete the work in: |
|---|
A. 6 days
B. 25/4 days
C. 15/2 days
D. 8 days
View Answer Discuss Work SpaceAnswer: option b
Explanation:
Let Akhil does x unit/day and Bishnu 3y unit/day.
Given, Total work = 5(x + 3y) = 3(2x + y)
=> x = 12y
Work done by Akhil alone in [5(x + 3y)]/x = 75y/12y = 25/4 days
| 24. | 12 men can complete a job in 12 days. How many extra days will be needed to complete the job if 6 men leave after working for 6 days? |
|---|
A. 3
B. 6
C. 9
D. 12
View Answer Discuss Work SpaceAnswer: option b
Explanation:
Man days to complete the job = 12 x 12 = 144
6 men in 6 days completed = 36 job
Job left = 144 - 36 = 108
Number of days required to complete this job = 108/6 = 18
So, 6 more men are needed.
| 25. | 20 men completed one-third of a job in 20 days. How many more men should be employed to finish the rest of the work in 25 more days? |
|---|
A. 10
B. 12
C. 15
D. 18
View Answer Discuss Work SpaceAnswer: option b
Explanation:
Work done = 20 x 20 = 400 men-days (1/3 rd)
Work left = 800
men needed for this = 800/25 = 32
So, (32 - 20) = 12 more men are needed.
Time and Work Questions and Answers FAQ
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