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21000 ft = 3.97727 mile
about 4 (3.98) miles
Answer: 21000 ' = 3.97727 mi. OR 3 mi. and 1720.0 yd
43000 ft = 8.1 miles, approx.
Since there are 5,280 feet in a mile, there are 3.97 miles in 21,000 feet.