If you mean m as in meters,
20 km = 20,000 m
as 1 km = 1000 m If you mean m as in miles,
20 km = 12.43 miles
as 1 mile = 1.61 km
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1000 m = 1 km → 20 m = 20 ÷ 1000 km = 0.02 km
I km is 1000 m
1000 m = 1 km
1 km = 1,000 m 2 km = 2,000 m 3 km = 3,000 m . . . 51 km = 51,000 m 51.42 km = 51,420 m
1000 m = 1 km, 24,000 m = 24 km.