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?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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