A train travelling at 36 kmph crosses a platform in 20 seconds and a man standing on the platform in 10 seconds. What is the length of the platform in meters?
Explanation:
Speed of train = 36 kmph = 36 × 5 /18 = 10 m/s
Let the length of the platform be P and length of the train be T.
Now, the train crosses the platform in 20 seconds and the man in 10 seconds.
Hence, the train traveled P + T in 20 seconds and T in 10 seconds.
Hence, it traveled P distance in 20 – 10 = 10 seconds.
Hence, P = 10 × 10 = 100 meters.
Hence, option (b).
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