400km

400 kilometers is a unit of distance. It is equivalent to 400,000 meters. In the imperial system, 400 kilometers is approximately 248.55 miles. This distance is often used to describe the range of certain vehicles, the length of journeys, or the size of geographical areas. For example, a flight of 400 kilometers would be a relatively short-haul trip. Many cities that are roughly 400 kilometers apart are considered to be within easy driving distance for a day trip or a weekend getaway. The Earth's circumference at the equator is approximately 40,075 kilometers, making 400 kilometers a small fraction of its total distance around. When considering travel, 400 kilometers can be covered by car in several hours, depending on speed limits and traffic conditions. For instance, at an average speed of 100 kilometers per hour, it would take approximately four hours to travel 400 kilometers. It is a common metric for distance in many parts of the world that use the metric system.