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A train went 300 km from City to city at an average speed of 100 km/h. At what speed did it travel on the way back if/his its average speed for the whole trip was 120 km/h

A train went 300 km from City to city at an average speed of 100 km/h. At what speed did it travel on the way back if/his its average speed for the whole trip was 120 km/h Correct Answer 150 km/h

Let, Way back speed = x ATQ, 2×x×100/(x + 100) = 120 Or, 200x/(x + 100) = 120 Or, 200x = 120x + 12000 Or, 80x = 12000 Or, x = 150

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