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Q:

A and B can do a work in 12 days, B and C in 15 days, C and A in 20 days. If A, B and C work together, they will complete the work in 

  • 1
    5 days
  • 2
    $$ 7{5\over6}$$
  • 3
    10 days
  • 4
    $$ 15{2\over3}$$
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Answer : 3. "10 days "

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