Q. A train 120 m long crosses a man walking at 6 km/h in same direction in 12 seconds. What is the speed of the train?
✅ Correct Answer: (B)
42 km/h
Explanation: Relative speed = 120/12 = 10 m/s = 36 km/h → Train speed = 36+6 = 42 km/h.
Explanation by: Hriday
Relative speed = 120/12 = 10 m/s = 36 km/h → Train speed = 36+6 = 42 km/h.