A train 200 m long is running at 72 km/h. How long will it take to cross a platform 120 m long?

💡 Solution & Explanation

To cross a platform, the train covers its own length plus the platform: 200 + 120 = 320 m. Speed = 72 × 5/18 = 20 m/s. Time = 320 ÷ 20 = 16 seconds. Using only the train's length gives 10 seconds, which is the time to pass a pole, not a platform.