km means kilometers, and kilo means 1000. Multiply the number of kilometers by 1000.
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There are 1000 meters in a km, so ther are 345,000 meters in 345 km.
2100 meters = 2.1 km 1.4 km = 1400 meters
1.25 kilometers = 1,250 meters
1250 m
3 KM