Question : Directions: If a train 150 m long crosses a pole in 12 seconds, then what is the speed of the train in km/h?
Option 1: 45
Option 2: 60
Option 3: 50
Option 4: 75
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Correct Answer: 45
Solution : Given: Length of a train = 150m Time taken to cross the pole = 12sec
So, Speed = Distance ÷ Time = 150 ÷ 12 = $\frac{25}{2}$ m/sec Convert it to km/h→$\frac{25}{2} × \frac{18}{5}$ = 45 km/h
So, 45 km/h is the required answer. Hence, the first option is correct.
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