A train 180 meters long takes 20 seconds to cross a platform 120 meters long. What is the speed of the train in km/h?
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Correct answer: A
Explanation
Length of the train = 180 meters
Length of the platform = 120 meters
Time = 20 seconds
Total distance = 180 + 120 = 300 meters
Speed = 300 / 20 = 15 m/s
In km/h = 15 × 18/5 = 54 km/h