Question : A train of length 180 m takes 40 seconds to cross a tunnel of length 500 m. What is the speed of the train, in km/hr?
Option 1: 71.2
Option 2: 61.2
Option 3: 80.5
Option 4: 52.5
Correct Answer: 61.2
Solution :
Given: A train of length 180 m takes 40 seconds to cross a tunnel of length 500 m.
Use the formula, $\text{Speed}=\frac{\text{Distance}}{\text{Time}}$.
Train’s speed = $\frac{180+500}{40}=\frac{680}{40}$ m/s
Convert m/s into km/h by multiplying with $\frac{18}{5}$,
$\frac{680}{40}$ m/s = $\frac{680}{40}\times \frac{18}{5}$ km/hr = 61.2 km/hr
Hence, the correct answer is 61.2 km/hr.
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