A train 100 meters long takes 6 seconds to cross a man walking at 5 km/h in the opposite direction. What is the speed of the train?
Q1. A train 100 meters long takes 6 seconds to cross a man walking at 5 km/h in the opposite direction. What is the speed of the train?
Answer: 55 km/h
Explanation: Relative speed = distance/time = 100/6 m/s = (100/6) * (18/5) km/h = 60 km/h. Since they are moving in opposite directions, the relative speed = speed of train + speed of man. So, 60 = speed of train + 5, hence speed of train = 55 km/h.