A train 315 m long is running at a speed of 54 km/h. What time will it take to cross a pole on its route?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e 21 s.
Speed = 54 km/h
To convert to m/s, multiply by 5/18: 54 × (5/18) = 15 m/s
Time = Distance ÷ Speed
Time = 315 ÷ 15 = 21 seconds