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Tips for Hourglass Problem

Solution to the 15-Minute Problem

Follow the steps below to measure 15 minutes:
  1. Reverse both the 7-minute and the 11-minute hourglasses
  2. Let the time pass for 7 minutes
  3. Reverse the 7-minute hourglass
  4. Let the time pass for 4 minutes
  5. Reverse the 7-minute hourglass
  6. Let the time pass for 4 minutes

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