Question : A 240 metre long train passes a telegraph post in 16 seconds. What is the speed of the train?
Option 1: 50 km/h
Option 2: 52 km/h
Option 3: 54 km/h
Option 4: 56 km/h
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Correct Answer: 54 km/h
Solution : Given: The distance of the train is 240 m and it takes 16 seconds to cross the telegraph post. We know that, $\text{Speed}=\frac{\text{Distance}}{\text{Time}}$. To convert m/s into km/h, multiply with $\frac{18}{5}$, we get, So, the train speed is given as, $\frac{240}{16}$ m/s. $=\frac{240}{16}\times\frac{18}{5}=54$ km/h Hence, the correct answer is 54 km/h.
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