Discussion
A train 120 m long passes a telegraph post in 6 seconds. Find the speed of the train.
Answer: D
A telegraph post has no length, so the train covers only its own 120 m.
\[ v = \frac{120}{6} = 20 \text{ m/s} \]
\[ 20 \times \frac{18}{5} = 72 \text{ km/hr} \]
The factor \( \tfrac{18}{5} \) converts m/s to km/hr.
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