Given this paragraph about marathon, what is the distance covered in kilometres and what are the most common ways to complete one?

The marathon is a long-distance foot race with a distance of 42.195 km (26 mi 385 yd), usually run as a road race, but the distance can be covered on trail routes. The marathon can be completed by running or with a run/walk strategy. There are also wheelchair divisions. More than 800 marathons are held throughout the world each year, with the vast majority of competitors being recreational athletes, as larger marathons can have tens of thousands of participants.

The distance covered in a marathon is 42.195 kilometers and it can be completed by running and walking combined, though there are also possibilities for wheelchair participants.