Answer: There are about 0.62 miles in a kilometer.
A more exact answer: One mile is 5,280 feet. One foot is 0.3048 metres. Therefore onemile is 1,609.344 meters, or 1.609344 km. Dividing 1 km by thatfigure gives the answer that one km is 0.6213711 mile.
Answer: 400m = one lap around the track. That means that 2.5 laps around the track is 1000m or 1k. Since we need 5k we are going to multiply it by 5. 2.5lapes(1k) times 5 = 12.5 laps. That means to run a 5k on the track you need to run 12.5 laps witch is 3 miles and 200 meters. 200 meters converted to miles = .125.
That means a 5k = 3.125 miles exactly. Think it through. Dont use a conversion website.