Use the units to help figure this out.
There are 5280 feet per mile = 5280 ft / 1 mile
There are 3600 seconds in an hour = 3600 sec / 1 hour
80 Miles / 1 hour = 422400 ft / 1 hour = 422400 ft / 3600 Sec = 117.3333 ft / sec
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Feet per second x 0.3048 = meters per second.
1,100 feet per second = 66,000 feet per minute
Feet per second x 0.68 = mph
80.6666667 feet per second
146.6 feet per second.