There are 1000 m per km, or .001 km per m. 1900m = 1.9 km.
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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
1,000 m = 1.000 km 123 m = 0.123 km
1000 m = 1 km, 24,000 m = 24 km.