2 billion miles.
4.7 billion km is 2,920,444,603.515 miles.
3,100,000,000 km divided by 1.6 = 1.94 billion miles
7.5 billion kilometers = ~4.7 billion miles.
5.2 billion km is 3,231,129,200 miles.
2 billion miles = 3,218,688,000 km
5.1 billion km is ~3.2 (3.16899) billion miles.
Answer: 4,000,000,000 mi. = 6,437,376,000 km
4.5 billion km = ~2.8 billion miles.
19.8839 miles.
Answer: 32 km = 19.8838 mi.
Nine billion miles equates to 14,484,096,000 km
4.7 billion km equates to 2,920,443,700 miles.