A train 100 meters long takes 3 seconds to cross a man walking at 5 km/h in the same direction. What is the speed of the train?
Q1. A train 100 meters long takes 3 seconds to cross a man walking at 5 km/h in the same direction. What is the speed of the train?
Answer: 45 km/h
Explanation: Relative speed = (length of train) / (time taken) = 100 / 3 m/s = (100/3) * (18/5) km/h = 120 km/h. Let the speed of the train be S. Relative speed = S - 5.