Train X, 270 m long and running at 72 km/h, overtakes train Y, 230 m long and running at 36 km/h in the same direction. How long does X take to pass Y completely?
Correct answer D. 50 seconds
Explanation
Relative speed = 72 − 36 = 36 km/h = 10 m/s. Combined length = 500 m, so time = 500 / 10 = 50 seconds.
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