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Q:

 Pipe A alone & pipe B alone can fill the same tank in 5 hours and 4 hours respectively. If the ratio of efficiency of pipe A & B together to that of pipe C alone is 9:2, then find time taken by pipe C alone to fill the same tank?

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

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