Discussion
A train 400 m long can cross an electric pole in 20 sec and then find the speed of the train?
Answer: C
An electric pole has no length, so the train covers only its own 400 m.
\[ v = \frac{400}{20} = 20 \text{ m/s} \]
\[ 20 \times \frac{18}{5} = 72 \text{ Kmph} \]
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