Question : 150 metres long train passes a telegraphic post in 12 seconds. Find the speed of the train (in km/h).
Option 1: 50
Option 2: 12.5
Option 3: 25
Option 4: 45
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Correct Answer: 45
Solution :
Given: The distance of the train is 150 m and its time taken is 12 seconds.
We know that, $\text{Speed}=\frac{\text{Distance}}{\text{Time}}$
To convert m/s into km/h multiply by $\frac{18}{5}$ and we get,
So, the speed of the train = $\frac{150}{12}\times \frac{18}{5}= 45$ km/h
Hence, the correct answer is 45 km/h.
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