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Q:

Pipe A can fill a tank in 6 hours. Pipe B can fill the same tank in 10 hours – pipe A, B, C together can fill the same tank in 12 hours. In how many hours pipe C can fill the tank alone?

  • 1
    $$12{1\over2} $$ hours
  • 2
    4 hours
  • 3
    15 hours
  • 4
    Not possible
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Answer : 4. "Not possible"

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