To get ft/s divide ft/hour by the number of seconds in an hour
1 US statute mile = 5280ft
45 miles = 237,600ft
1 hour = 3600 seconds
237,600 / 3,600 = 66ft/s
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40 mph = about 58.6 feet per second.
52 miles per hour equals 274560 feet per hour, divided by 60: equals 4576 feet per minute, divided by 60: equals 76.266666 or 76.27 feet per second.
37,000 (feet per second) = 25,227.27 mph
102 and 2/3 feet per second.
80 ft\sec *60=4800ft\min*60=288,000ft\hour and when divided by 5280 feet\mile that equals 54.55 miles per hour