A train travelling at a speed of 30 m/sec crosses a platform,

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A train travelling at a speed of 30 m/sec crosses a platform, 600 metres long, in 30 seconds. The length (in metres) of train is

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

Correct Option: D

Let the length of train be x
According to the question,

x + 600	= 30
30

⇒ x + 600 = 900
⇒ x = 900 – 600 = 300 m