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- Question
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
- Correct Answer
- 14 days
ExplanationLet 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.
- 1. 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
- 2. 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
- 3. 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 Discuss
- 4. 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
- 5. 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
- 6. 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
- 7. 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
- 8. Robin can do a work alone in 9 days. Amit can do the same work alone in 6 days. Both of them finish the work together and they get a total Rs 2500. What isthe share (in Rs) of Robin?
Options- A. 1700
- B. 1200
- C. 1500
- D. 1000 Discuss
- 9. A does 1/2 as much work as B and C does1/2as much work as A and B together. If C alone can finish the work in 40 days, then together all will finish the work in
Options- A. 30 days
- B. 40/3 days
- C. 15 days
- D. 16 days Discuss
- 10. If 5 person together can make 5 mats in 5 hrs, then 10 person in 10 hours will make
Options- A. 20 mats
- B. 10 mats
- C. 15 mats
- D. 5 mats Discuss
Time and Work problems
Search Results
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: 3
Correct Answer: 15
Correct Answer: 24/7
Correct Answer: 2
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
Correct Answer: 1000
Correct Answer: 40/3 days
Correct Answer: 20 mats
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