18,000 feet = 3.41 miles.
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1 mile = 5280 ft so 18000 ft = 3.409091 miles.
3.4 miles deep
3.409 miles. 5280 feet per mile. Divide 18000/5280=3.409
7500 feet=1.42045455 miles
171 miles is 902880 feet. There are 18000 seconds in 5 hours. So in one second, you would travel 50.16 feet, which is just under 50 feet and 2 inches.