Since a kilometer has 1000 meters, and a meter has 1000 millimeters, you must multiply the number of kilometers by a million.
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2000
1000 m = 1 km ⇒ 12.5 m = 12.5 ÷ 1000 km = 0.0125 km
1000 km is equal to 621.38818 miles
1000 mm = 1 m = 0.001 km
1 km
there are 1000 metres in a km which is the same as there are 1000 m in a km