500 feet per second = 340.9 mph
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21 feet per second is approximately 14 miles per hour.
About 245.45 miles per hour at 360ft/s
To convert miles per hour to feet per second, you need to multiply by 1.4667. Therefore, a car traveling at 140 miles per hour is moving at approximately 205.33 feet per second.
150 feet per second (fps) is equivalent to approximately 102 miles per hour or 164 kilometers per hour.
To convert 80 millimeters per second to miles per hour, you first convert millimeters to miles and seconds to hours. There are approximately 0.000000621371 miles in a millimeter and 3600 seconds in an hour. So, 80 millimeters per second is roughly 10.56 miles per hour.