Question : The time taken for a train of length 110 metres running at a speed of 72 km/h to cross a bridge of length 132 metres is:
Option 1: 9.8 seconds
Option 2: 12.1 seconds
Option 3: 12.42 seconds
Option 4: 14.3 seconds
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Correct Answer: 12.1 seconds
Solution :
Given: The distance of the train is (110 + 132) = 242 m and its speed is 72 km/h.
We know that, $\text{Time}=\frac{\text{Distance}}{\text{Speed}}$
To convert km/h into m/s, we multiply by $\frac{5}{18}$.
72 km/h = $72\times \frac{5}{18}$ m/s
= 20 m/s
So, the time taken by the train to cross the bridge $=\frac{242}{20}=12.1$ seconds.
Hence, the correct answer is 12.1 seconds.
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