Question : If a train is 60 metres long and travelling at 36 km/hr, how long will it take to pass by a telegraph post?
Option 1: 9 seconds
Option 2: 8 seconds
Option 3: 7 seconds
Option 4: 6 seconds
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Correct Answer: 6 seconds
Solution :
Given: The distance of the train is 60 m and its speed is 36 km/h.
To convert km/h into m/s, multiplying by $\frac{5}{18}$ and we get,
= $36\times \frac{5}{18}$ = 10 m/s
We know that, $\text {Time}=\frac{\text{Distance}}{\text{Speed}}$
So, the train will take the required time, $\frac{60}{10}=6$ seconds.
Hence, the correct answer is 6 seconds.
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