Question : A train is 250 meters long. If the train takes 50 seconds to cross a tree by the railway line, the speed of the train in km/h is:
Option 1: 10
Option 2: 9
Option 3: 5
Option 4: 18
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Correct Answer: 18
Solution :
Given: A train is 250 meters long.
The train takes 50 seconds to cross a tree.
So, the speed of the train = $\frac{250}{50}$ = 5 m/sec
Converting this to km/h, we have,
⇒ $5×\frac{18}{5}$ = 18 km/h
Hence, the correct answer is 18.
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