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Alen and Border can do a work individual...

Alen and Border can do a work individually in 21 and 42 days respectively. In how many days they can complete the work, working alternatively?

A

14

B

28

C

42

D

35

Text Solution

Verified by Experts

The correct Answer is:
B
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ARIHANT SSC-TIME AND WORK-EXERCISE(LEVEL 1)
  1. A takes 6 days less than B to do a certain job and 2 days more than C....

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  2. A and B undertook a work for Rs. 350. A got Rs. 150 more than that of ...

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  3. Alen and Border can do a work individually in 21 and 42 days respectiv...

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  4. C takes twice the number of days to do a piece of work than A takes. A...

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  5. When A, B and Care deployed for a task, A and B together do 70% of the...

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  6. Colonel, Major and General started a work together for Rs. 816. Colone...

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  7. Sharma is 20% less efficient than Kelkar. If Kelkar can do a piece of ...

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  8. 30 persons can do a piece of work in 24 days. How many more people are...

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  9. 12 women can do a piece of work in 20 days. If the 4 women deny to wor...

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  10. 35 boys can do a piece of work in 15 days. The work will completed in ...

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  11. 24 men can complete a job in 40 days. The number men required to compl...

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  12. 16 men finished one-third work in 6 days. The number of additional men...

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  13. If 10 persons can do a job in 20 days, then 20 person with twice the e...

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  14. A certain job was assigned to a group of men to do in 20 days. But 12 ...

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  15. 30 workers can finish a work in 20 days. After how many days should 9 ...

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  16. 25 men can complete a job in 30 days. After how many days should the s...

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  17. A group of workers can complete a job in 120 days. If there were 4 mor...

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  18. Mr. Modi can copy 40 pages in 10 minutes, Mr Xerox and Mr. Modi both w...

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  19. 20 persons completed (1)/(3)rd of the work in 24 days. How many more p...

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  20. A contractor undertook a work to complete in 60 days. But just after 2...

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