4.7 billion km is 2,920,444,603.515 miles.
2 billion miles.
3,100,000,000 km divided by 1.6 = 1.94 billion miles
7.5 billion kilometers = ~4.7 billion miles.
Answer: 4,000,000,000 mi. = 6,437,376,000 km
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.
4.5 billion km = ~2.8 billion miles.
4.7 billion km equates to 2,920,443,700 miles.
Nine billion miles equates to 14,484,096,000 km
Planet Neptune is 2.80 billion miles (4.50 billion km) from the sun.
3.157 billion km = 1.96166885 × 109 miles.