Question : A train, 200 metres long, is running at a speed of 54 km/h. The time in seconds that will be taken by the train to cross a 175 metres long bridge is:
Option 1: 12.5
Option 2: 20
Option 3: 25
Option 4: 10
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Correct Answer: 25
Solution :
Given: Length of train = 200 m and length of bridge = 175 m.
Its speed is 54 km/h.
To convert km/h into m/s, multiply with $\frac{5}{18}$, we get
$54 \times\frac{5}{18}=15$ m/s
We know that $\text{time}=\frac{\text{Distance}}{\text{Speed}}=\frac{200+175}{15} = \frac{375}{15}=$ 25 seconds
Hence, the correct answer is 25.
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