Answer: 1 hour is 504KM
Step-by-step explanation: Total distance covered by it in 4 hours is 1620 km. We also know that average distance = total distance/ total time. => average distance = 1620/4 km/hr = 504 km/hr. Hence, the average distance covered in 1 hour is 504km. (its kinda both but u can do whatever u want to solve it!)