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Question

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


  1. days

  2. 5 days

  3. days

  4. 8 days

  5. 10 days


Solution

The correct option is E

10 days


Let A take a days, B take b days and C takes c days to complete the work.

2(1a+1b+1c)=112+115+120

Total work would be done in 10 days if they work together.

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