A train travailing at a speed of 30 m/s crosses a 600 m

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A train travailing at a speed of 30 m/s crosses a 600 m long platform in 30 s. Find the length of the train.

1. 120 m
2. 150 m
3. 200 m
4. 300 m

Correct Option: D

Let length of the train be x m.
Relative length of the train = (x + 600) m
According to the question,
(x + 600)/30 = 30
⇒ x + 600 = 900
∴ x = 900 - 600 = 300 m