Question
A train 180 m long passes a man standing on a platform
in 12 seconds and passes the platform completely in 30 seconds. Find the speed of the train in km/h and the length of the platform.Solution
ATQ, Speed of train: Speed = distance / time (when passing the man) = 180 / 12 = 15 m/s Convert to km/h: 15 × (18/5) = 54 km/h When passing the platform, distance covered = length of train + length of platform Let platform length = L. Speed = 15 m/s, time = 30 s ⇒ 15 × 30 = 180 + L 450 = 180 + L ⇒ L = 270 m Speed = 54 km/h, platform length = 270 m.
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