• A train travelling at a speed of 30 m/s crosses a 600 m long platform in 30 s. Find the length of the train.
 A) 120 m B) 150 m C) 200 m D) 300 m

 D) 300 m

Let length of the train be x m.

Relative length of the train = (x + 600) m

According to the question,

$$\Large \frac{x+600}{30}=30 => x+600 = 900$$

Therefore, x = 900 - 600 = 300 m

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