Discussion
A train 240 m in length crosses a telegraph post in 16 seconds. The speed of the train is?
Answer: C
Crossing a telegraph post means covering the train's own length.
\[ v = \frac{240}{16} = 15 \text{ m/s} \]
\[ 15 \times \frac{18}{5} = 54 \text{ kmph} \]
The conversion factor \( \tfrac{18}{5} \) turns m/s into kmph; using \( \tfrac{5}{18} \) by mistake would give 4.17 kmph, far too slow for a train.
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