A train went 300 miles from City X to City Y at an average speed of 100 mph. At what speed did it travel on the way back if its average speed for the whole trip was 120 mph?

A train went 300 miles from City X to City Y at an average speed of 100 mph. At what speed did it travel on the way back if its average speed for the whole trip was 120 mph? Correct Answer 150 mph

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