Discussion
A train 200 m long crosses a platform 300 m long in 25 seconds. What is its speed ?
Answer: B
Correct answer: 72 km/hr
To clear a platform the train must cover its own length plus the platform’s.
\[\text{Distance} = 200 + 300 = 500 \text{ m}, \qquad \text{Speed} = \frac{500}{25} = 20 \text{ m/s}\]
\[20 \times \frac{18}{5} = 72 \text{ km/hr}\]
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