Without stoppage, a train travels a certain distance with an average speed of 50 km/h, and with stoppage, it covers the same distance with an average speed of40 km/h. On an average, how many minutes per hour does the train stop during the journey ?

Correct answer marked below

9 min/h

10 min/h

11 min/h

12 min/h

Correct

15 min/h

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What this question tests

Your application of distance = rate × time to trains, boats, and commuters, including relative speed.

Mixing units (miles per hour vs. minutes) or averaging speeds — average speed is total distance over total time.