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Q:

Two pipe can fill a cistern in 3 hours and 4 hours respectively and a waste pipe can empty it in 2 hours. If all  the three pipes are kept open, then the cistern will be filled in

  • 1
    5 hours
  • 2
    8 hours
  • 3
    10 hours
  • 4
    12 hours
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Answer : 4. "12 hours"

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