Correct Answer - Option 3 : 75
Given:
A train of length 250 metre crosses a pole in 12 seconds.
Formula:
Speed = Distance/Time.
1 meter/second = (18/5) kilometres/hour
Concept:
Time taken by a train to cross a pole is equal to the time taken by the train to cover the distance equal to its length.
Calculation:
According to the concept used,
The train covers 250 metres in 12 seconds.
As per the formula,
Speed of the train = 250/12
⇒ 250/12 = (125/6) metre/second
⇒ (125/6) × (18/5) kilometres/hour
⇒ 75 kilometres/hour
∴ The speed of the train is 75 kilometres/hour.
