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Three friends Anne, Bob and Chris work...

Three friends Anne, Bob and Chris work together to do a certain hob. The time it takes them to do the work together is 6 hours less than Anne would have take alone, 1 hour less than Bob would have taken alone and half the time Chris taken working alone. How long did it take them to complete the job, working together? `20\ min` b. `30\ min` c. `40\ min` d. `50\ min`

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RS AGGARWAL-TIME AND WORK-All Questions
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  2. Two workers A and B are engaged to do a piece of work.Working alone, A...

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  3. Three friends Anne, Bob and Chris work together to do a certain hob....

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  4. To do a piece of work, B takes 3 times as long as A and C together and...

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  5. P can complete a work in 12 days working 8 hours a day. Q can compl...

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  6. A and B together can complete a work in 12 days, B and C together c...

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  7. A can do a piece of work in 4 hours, B and C together in 3 hours, a...

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  8. A and B can do a work in 8 days, B and C can do the same work in 12...

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  9. A and B together can do a job in 2 days; B and C can 2 do it in 4 d...

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  10. A and B can do a piece of work in 5 days; B and C can do it in 7 days;...

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  11. A and B can do a piece of work in 12 days, B and C in 8 days and C and...

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  12. Madhu takes twice as much time as Uma to complete a work and Rahul ...

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  13. A takes 5 days more than B to do a certain job and 9 days more than...

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  14. A works twice as fast as B. If B can complete a work in 12 days ind...

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  15. A is twice as good a workman as B. If they work together, they can ...

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  16. David and Michael together can finish a job in 4 days 19 hrs 12 min. I...

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  17. A is thrice as good a workman as B and so takes 60 days less than B fo...

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  18. A and B can do a job together in 7 days. A is 1 3/4 times as efficient...

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  19. Kamal can do a work n 15 days. Bimal is 50% more efficient than Kam...

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  20. A does 20% less work than B. If A can finish a piece of work in 7(1)/(...

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