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A can do a piece of work in 30 days and ...

A can do a piece of work in 30 days and B can do same work in 60 days. In how many days will A & B do this work together ?

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The correct Answer is:
20 days
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ADVANCED MATHS BY ABHINAY MATHS ENGLISH-TIME & WORK -QUESTIONS
  1. A can do a piece of work in 30 days and B can do same work in 60 days....

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  2. A, B and C can do a piece of work in 12, 15 and 20 days respectively. ...

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  3. (A + B) can do a piece of work in 20 days and A can do same work in 60...

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  4. A can do a piece of work in 10 days and B can do same work in 15 days....

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  5. A can do a piece of work in 20 days and B can do same work in 25 days....

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  6. A can do a piece of work in 12 days and B can do same work in 18 days....

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  7. A can do a piece of work in 20 days and B can do same work in 15 days....

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  8. (A + B) can do a piece of work in 10 days. A works 2(1)/(2) days and ...

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  9. (A + B) can do a piece of work in 14 days. A works 3(1)/(2) days and...

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  10. (A + B) can do a piece of work in 5 days. If A works with twice of his...

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  11. (A + B) can do a piece of work in 5 days. If A works with twice of his...

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  12. A can do a piece of work in 4 hours. (B + C) can do the same work in 3...

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  13. A can make (1)/(3) part of a wall in 9 days and B can make (2)/(3) p...

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  14. A can do (13)/(56) part of a work in 111 days and B can do (43)/(56) ...

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  15. A can do (1)/(4) part of a work in 21 days and B can do (1)/(4) part...

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  16. (A + B) can do a piece of work in 12 days. (B + C) can do same work in...

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  17. (A + B) can do a piece of work in 12 days. (B + C) can do same work in...

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  18. A work for 2 days, then B complete the remaining work in 9 days. If A ...

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  19. A can do a piece of work in 80 days. A works for 10 days, then B compl...

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  20. A and B can do a piece of work in 45 and 40 days respectively. They...

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