21 feet per second is approximately 14 miles per hour.
About 245.45 miles per hour at 360ft/s
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.
150 feet per second (fps) is equivalent to approximately 102 miles per hour or 164 kilometers per hour.
2500 feet per second (fps) is equivalent to approximately 1704 miles per hour.
15.0 feet per second is equivalent to: 10.23 miles per hour.
293.2 miles per hour.
1200 feet per second is equivalent to approximately 818 miles per hour.
395 (feet / second) = 269.32 mph
About 4,132 miles per hour.
About 20.5 miles per hour.
3,600 miles per hour.
465 feet per second is equal to about 317 miles per hour.
It is 2,727 MPH. And that's fast.
280 feet per second is 190.91 miles per hour.
That is 146.7 feet per second.
It's 10.2 miles per hour. (rounded)