Discussion
A train passes a man standing on the platform. If the train is 170 meters long and its speed is 72 kmph, how much time it took in doing so?
Answer: D
\[ 1 \text{ kmph} = \frac{5}{18} \text{ m/s} \]
\[ 72 \text{ kmph} = 20 \text{ m/s} \]
A man is a point, so only the train's own length is covered:
\[ t = \frac{170}{20} = 8.5 = 8\tfrac{1}{2} \text{ sec} \]
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