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Q: If pipe A can fill a cistern in X hours, pipe B can fill the same cistem in Y hours, and pipe C and empty the full cisten in Z hours, then the time taken to completely fill the cistern, if pipes A, B and C are opened to gather.
  • A.
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  • B.
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  • C.
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  • D.
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Correct Answer: Option A -
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Explanations:

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