A train 150 metres long crosses a 350 metre platform completely in 20 seconds. What is the speed of the train in km/h?
Q1. A train 150 metres long crosses a 350 metre platform completely in 20 seconds. What is the speed of the train in km/h?
Answer: 90 km/h
Explanation: The train must cover 500 metres in 20 seconds, giving 25 m/s. Converting gives 25 times 18/5, which is 90 km/h.