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Q. Two pipes A and B can fill a cistern in 37.5 minutes and 45 minutes respectively. Both pipes are opened. The cistern will be filled in just half an hour, if the B is turned off after:

  • (A) 5 min.
  • (B) 9 min.
  • (C) 10 min.
  • (D) 15 min.
  • Correct Answer - Option(B)
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  • Filed under category Math
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