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      Question

      A train runs at an average speed of 96 km/hr when not

      halted. Including stoppages, its average speed drops to 72 km/hr for the same journey. For how many minutes per hour does the train remain stationary?
      A 12 mins Correct Answer Incorrect Answer
      B 15 mins Correct Answer Incorrect Answer
      C 24 mins Correct Answer Incorrect Answer
      D 30 mins Correct Answer Incorrect Answer

      Solution

      Time of stoppages per hour = Difference in average speeds / Speed without stoppage × 60
      So, time of stoppages per hour = (96 – 72)/96 × 60 = 15 minutes
      Therefore, the train remains stationary for  15 minutes  per hour.

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