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170 times 3600 (secs in an hour) divided by 5280 (feet in a mile) 170 x 3600/5280 = 115.91 mph
5280 ft = 1 mile so, 5.5 ft = 5.5/5280 miles. 3600 seconds = 1 hour so, 1 second = 1/3600 hour 5.5 fps equates to, 5.5/5280 ÷ 1/3600 = 5.5 x 3600 / 5280 = 3.75mph
Multiply by 5280 to change miles to feet (1 mile = 5280 feet) and divide by 3600 to change hours to seconds (1 hour = 60 minutes = 3600 seconds).60 mph * 5280 feet / 3600 sec = 88 feet per second
(meters / sec) x (3600 sec / hr) / [(0.3048 meters / ft) x (5280 ft / mi)] 1.438*3600 / (0.3048*5280) = 3.2167144 mi / hr (mph)
1 mile = 5280 feet 1 hour = 3600 seconds So, 55 mph = 55*5280 feet per hour = 55*5280/3600 feet per second = 80.66... fps