A train 270 m long passes a person walking at 5 km/h in the same direction in 18 seconds. What is the speed of the train?

💡 Solution & Explanation

When both move the same way, the train passes the person at the difference of their speeds. That relative speed = 270 m ÷ 18 s = 15 m/s = 15 × 18/5 = 54 km/h. So the train's own speed = 54 + 5 = 59 km/h. Forgetting to add the walking speed gives 54 km/h.