Four.
20 laps
1 mile = 1.609 km = 1609 metres = 1609/200 laps = 8.047 laps.
4 laps of 400m (about 4 laps of 1/4 mile)
A lap of the track is a quarter of a mile. Therefore, four laps would total one mile.
24.85 laps
4 laps
38 laps exactly! Each mile has 4 quarters, thus: > 9 miles have 9 × 4 = 36 laps > a half mile has ½ × 4 = 2 laps for a total of 38 laps
4
How big the track is has bearing on the number of laps - a half-mile track would run 300 laps; a one-miler 150 laps; a 2.5-miler 60 laps.
12 and a half laps
4 laps. A "Quarter" really means just "a fourth". Each lap is one quarter of a mile. So, run 4 laps, it's a mile.