170 times 3600 (secs in an hour) divided by 5280 (feet in a mile)
170 x 3600/5280 = 115.91 mph
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170 miles = 170*5280 = 897,600 feet. So 170 mph = 879,600 ft per hour.
80 fps = 54.55 mph (rounded)
70 x 5280/3600 = 102.6 recurring fps
Convert 3000 fps to mph
680 mph