A train 120 m long at 68 km/h overtakes another train 180 m long running at 50 km/h in the same direction on a parallel track. How long does the overtaking take?
Correct answer C. 60 seconds
Explanation
Relative speed = 68 − 50 = 18 km/h = 5 m/s. Combined length = 300 m, so time = 300 / 5 = 60 seconds.
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