5280 ft = 1 mile
4224 ft = 4224/5280 = 0.8 miles.
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21,120 feet = 4 miles
3.78787879 miles :D
22 000 feet = 4.166.. miles
3.28084 feet = 1 meter (rounded) 22,841 feet = 6,961.94 meters (rounded)
Answer: 21000 ' = 3.97727 mi. OR 3 mi. and 1720.0 yd