Without stoppages, a train travels at an average speed of 60 km/h and with stoppages it covers the same distance at an average speed of 48 km/h. How many minutes per hour does the train stop?

In one hour without stoppages, the train covers 60 km. With stoppages, it covers only 48 km in one hour. So the train loses 12 km worth of running time per hour due to stoppages. At the actual running speed of 60 km/h, time taken to cover 12 km = (12/60)×60 = 12 minutes. Therefore, the train stops for 12 minutes per hour.