In general 1 lap is 1/4 miles and 1 mile is 1.6 km. 2 laps make 0.8 km. So approx. 2.5 laps make 1km.
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7.5 laps
Two and a half laps
20 laps
89.4 laps (approx).
70.4 laps. 25yds is 75 feet. (5280ft/mi)/75ft=70.4. If a lap is one length then 70.4 laps. If a lap is two lengths, i.e., up and back then its 35.2 laps.