Discussion
In what time will a train 100 m long cross an electric pole, it its speed be 144 km/hr?
Answer: A
\[ 1 \text{ km/hr} = \frac{5}{18} \text{ m/s} \]
\[ 144 \text{ km/hr} = 144 \times \frac{5}{18} = 40 \text{ m/s} \]
An electric pole has no length, so only the train's own 100 m is covered:
\[ t = \frac{100}{40} = 2.5 \text{ seconds} \]
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