1 km = 1000 metres so 145 km = 45*1000 = 4500 metres. Simple!
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1 km = 1000 meter 75 km = 75000 meter
0.45
0.001 km = 1 m
A km (kilometer) is larger than a meter. Their are 1000 meters in one kilometer.
1 km = 1000 meters 1 meter = 0.001 km