4.5 billion km = ~2.8 billion miles.
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3.67 billion miles = 5,906,292,480 km
1.59 billion miles
7.5 billion kilometers = ~4.7 billion miles.
45 km = 28 miles so 45 km per hour = 28 miles per hour.
2 billion miles3 218 688 000 kilometers == The formula used to arrive at the answer:2 billion mi*1.609344 km1 mi=3.2 billion km