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Q:

A work is done by three person A, B and C. A alone takes 10 hours to complete the work but B and C working together takes 4 hours, for the completion of the same work. If all of them worked together and completed 14 times of the work, then how many hours have they worked?

  • 1
    42 hr
  • 2
    28 hr
  • 3
    40 hr
  • 4
    20 hr
  • 5
    45 hr
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Answer : 3. "40 hr "

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