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- Question
A,B and C together can finish a task in 7.5 days. C is thrice as productive as A and B alone can do the task in 15 days. In how many days can A and C do the job if B goes on leave?
Options- A. 30
- B. 10
- C. 20
- D. 15
- Correct Answer
- 15
- 1. A can do 75% of a job in 9 days and B can do half of the job in 8 days. If they work on it together, then in how many days can they do half of the job?
Options- A. 40/7
- B. 24/7
- C. 7/2
- D. 9/2 Discuss
- 2. 12 men complete a work in 9 days. After they have worked for 6 days, 6 more men join them. How many days will they take to complete the remaining work?
Options- A. 2
- B. 3
- C. 4
- D. 5 Discuss
- 3. A & B together finish a job in 24 days, while A, B & C together can finish the same job in 8 days. C alone will finish the job in
Options- A. 12 days
- B. 14 days
- C. 16 days
- D. 24 days Discuss
- 4. A does 75% of a work in 25 days. He then calls in B and they together finish the remaining work in 5 days. How long B alone would take to do the whole work?
Options- A. 50 days
- B. 80 days
- C. 24 days
- D. 37.5 days Discuss
- 5. Amar is 2 times as good a workman as Badal and therefore is able to finish a job in 15 days less than Badal. In how many days can they together complete the job?
Options- A. 30 days
- B. 40 days
- C. 10 days
- D. 20 days Discuss
- 6. A, B and C can do job in 9, 12 and 36 days respectively if they worked alone. A leaves after they have worked together for 3 days. In how many days can B and C do the rest of the job?
Options- A. 3
- B. 4
- C. 5
- D. 6 Discuss
- 7. If 6 engines consume 24 metric tonnes of coal, when each is working 8 hours day, how much coal will be required for 9 engines, each running 13hours a day, it being given that 2 engines of former type consume as much as 3 engines of latter type ?
Options- A. 45 metric tonnes
- B. 47 metric tonnes
- C. 55 metric tonnes
- D. 34 metric tonnes Discuss
- 8. A can do a piece of work in 21 days and B in 28 days. Together they started the work and B left after 4 days. In how many days can A alone do the remaining work ?
Options- A. 14 days
- B. 18 days
- C. 21 deays
- D. 16 days Discuss
- 9. 10 boys can complete a work in 7 days and 10 girls take 14 days to complete the work. How many days will 5 boys and 10 girls take to complete the work ?
Options- A. 13 days
- B. 10 days
- C. 7 days
- D. 16 days Discuss
- 10. 50 men can complete a work in 28 days. They started the work together, but at the end of each 10th day, 10 men left the job. The work was completed in how many days?
Options- A. 36
- B. 38
- C. 40
- D. 45 Discuss
Time and Work problems
Search Results
Correct Answer: 24/7
Correct Answer: 2
Correct Answer: 12 days
Correct Answer: 50 days
Correct Answer: 10 days
Correct Answer: 3
Correct Answer: 45 metric tonnes
Explanation:
2 engines of former type for one hour consumes (2 x 24)/(6 x8) = 1 metric ton
i.e. 3 engines of latter type consumes 1 ton for one hour
Hence 9 engines consumes 3 tons for one hour
For 15 hours it is 15 x 3 = 45 metric tonnes.
Correct Answer: 14 days
Explanation:
Let A worked for x days.
x/21 + 4/28 = 1 => x = 18
A worked for 18 days. So, A can complete the remaining work in 18 - 4 = 14 days.
Correct Answer: 7 days
Explanation:
1 boy's 1 day work = 1/70
1 girl's 1 day work = 1/140
(5 boys + 10 girls)'s 1 day work = (5/70 + 10/140) = (1/14 + 1/14) = 1/7
5 boys and 10 girls will complete the work in 7 days.
Correct Answer: 40
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