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A and B working together can finish certain piece of work in 10 days. If A works at `(2)/(3)` of his actual efficiency and B works at `(5)/(3)` of his actual efficiency, then work will be completed in 9 days. If A works at `(1)/(2)` of his actual efficiency and B works at double of his actual efficiency, then in how many days work will be finished?

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The correct Answer is:
`8(4)/(7)` days
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ADVANCED MATHS BY ABHINAY MATHS ENGLISH-TIME & WORK -QUESTIONS
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  2. The ratio of efficiency of A and B is 3 : 5 and that of B and C is 2 :...

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  3. A and B working together can finish certain piece of work in 10 days. ...

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  4. A takes three times as long as (B + C) together to complete a work. B ...

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  5. B takes two times as long as (A + C) together to complete a work. C ta...

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  6. A does half as much work as B in one-sixth of the time.If together the...

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  7. A does half as much work as B in three-fourth of the time. If together...

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  8. A, B and C can do a work in 25, 40 and 60 days respectively. All three...

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  9. A, B and C can do a work in 10, 12 and 15 days respectively. All three...

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  10. A and B can do a work in 20 and 30 days respectively. They start the w...

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  11. (A + B) together can complete a job in 8 days. Both B and C working al...

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  12. A can complete a work in 18 days, B can do the same work in half the t...

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  13. B takes two times time as long as (A + C) together take to complete a ...

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  14. A does (4)/(5) part of the work in 20 days and rest of the work is do...

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  15. A can do (1)/(2) of a piece of work in 5 days B can do (3)/(5) of the ...

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  16. Rahul is twice efficient as Ram. If both of them can complete the work...

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  17. A and B working together can complete the work in 12 days. A can compl...

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  18. A, B and C can do a work in 12, 15 and 18 days respectively. They star...

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  19. A and B can do a work in 15 days and 20 days respectively B started th...

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  20. A, B and C can do a work in 20, 30 and 60 days respectively. A started...

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