Math Puzzles and Problem Solving

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Multiple Choice

Pipe A can fill in 20 minutes and Pipe B in 30 mins and Pipe C can empty the same in 40 mins.If all of them work together, find the time taken to fill the tank

  1. 20 mins
  2. 8 mins
  3. 17 1/7 mins
  4. 171/6 mins
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