alleryA 150-metre train at 54 km/h crosses a stationary pole. How long does it take?
A$8$ seconds
B$10$ seconds
C$12$ seconds
D$15$ seconds
Answer & Solution
Correct answer: B. $10$ seconds
We have 54 km/h = 54 × 5/18.
So 54 km/h = 15 m/s.
Time = length / speed = 150/15 = 10 seconds.
Crossing a pole uses only the train's own length.
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