Multiply the MPH by 5,280 feet per mile ( the number of feet in a mile ). The result is feet per hour. Divide the speed in feet per hour by 3,600 seconds per hour. The result is feet per second.
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Convert 3000 fps to mph
218 fps = 1486.36 mph
20 mph = 29.33... fps
170 times 3600 (secs in an hour) divided by 5280 (feet in a mile) 170 x 3600/5280 = 115.91 mph
60 mph = 88 fps (exactly)