A train 400 m long passes a pole in 20 seconds. What is the speed of the train?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 72 km/hr
While crossing a pole a train will cover its own distance
Speed = Distance/Time
Speed = 400/20 = 20m/s
To change speed m/s into Km/h we need to multiply the value by 18/5
20m/s = 20 × 18/5 = 72km/h.