There are 5280 feet in one mile. Therefore, one billion miles (1,000,000,000) is equal to 1,000,000,000 x 5280 = 5,280,000,000,000 feet.
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There are about189, 393miles in 1 billion feet
52.8 feet
42,240 feet in eight miles, or 5280 feet in one mile.
21,120 feet = 4 miles
10 miles = 52,800 feet (one mile = 5,280 feet)