A distance of 50 kilometers is equal to 31.069 miles. One mile is larger than one kilometer; one mile is equal to 1.6093 kilometers or 1,609.3 meters.
The word mile has its roots in the Latin word meaning thousand. A mile was defined as a thousand Roman strides, with a stride being defined as two paces. High school track and field teams in the United States stopped running the mile in the early 1980's. This was because tracks built at the time were 400 meters long instead of 440 yards. This caused the 1,600 meter run to replace the mile run.