Discussion

A train 150 m long is running at 72 km/hr. How long will it take to cross a pole ?

Answer: C

Correct answer: 7.5 seconds

Convert the speed to metres per second by multiplying by \(\tfrac{5}{18}\).

\[72 \times \frac{5}{18} = 20 \text{ m/s}\]

Crossing a pole means covering just the train’s own length, since a pole has no length of its own.

\[t = \frac{150}{20} = 7.5 \text{ seconds}\]

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