Two trains, each 125 m long, run in opposite directions on parallel tracks and cross each other in 10 seconds. If one runs at 40 km/h, what is the speed of the other?
Correct answer A. 50 km/h
Explanation
Relative speed = (125 + 125) / 10 = 25 m/s = 90 km/h. The other train runs at 90 − 40 = 50 km/h.
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