Q. A train takes 18 seconds to cross a platform 90 m long and 6 seconds to cross a pole. What is the speed of the train?
✅ Correct Answer: (B)
45 km/h
Explanation: Train length = x; Speed = x/6; (x+90)/18 = x/6 → x=75 m → Speed = 75/6 = 12.5 m/s = 45 km/h.
Explanation by: Hriday
Train length = x; Speed = x/6; (x+90)/18 = x/6 → x=75 m → Speed = 75/6 = 12.5 m/s = 45 km/h.