A train 120 meters long, crosses a pole in 10 seconds.

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A train 120 meters long, crosses a pole in 10 seconds. The speed of the train is ?

1. 40 km/hr
2. 43.2 km/hr
3. 45 km/hr
4. None of these

Correct Option: B

Length of train = 120 m.
Total taken in crossing the pole = 10 seconds.
Speed of the train = length / time
= 120 / 10
= 12 m/s
= 12 x (18/5)
= 43.2 km/hr