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A Tyre has two punctures. The first puncture alone would have made the Tyre flat in 9 minutes and the second alone would have done it in 6 minutes.If air leaks out at a constant rate, how long does it take both the punctures together to make it flat?

  1 1/2 minutes
  3 1/2 minutes
  3 3/5 minutes
  4 1/4 minutes