A train travels from City A to City B at a constant speed of 80 km/h and returns from City B to City A at a constant speed of 100 km/h. What is the average speed of the train for the entire round trip?

Correct answer marked below

85 km/h

89 km/h

Correct

90 km/h

92 km/h

95 km/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.