Q: A train covers 360 km in 4 hours. Speed in km/h and m/s? Time to cover 450 km at same speed? Step 1: Speed = 360/4 = 90 km/h. Step 2: In m/s: 90 × 5/18 = 25 m/s. Step 3: Time for 450 km = 450/90 = 5 hours.