300 feet per second = 204.54 mph
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75 feet per second; about 50 mph.
250 feet per second = 170.45 mph
15.0 feet per second is equivalent to: 10.23 miles per hour.
It is 2,727 MPH. And that's fast.
A plane going 300 miles per hour is going 440 feet per second. (300 * 5280 / 60 / 60) In four hours, it will have traveled 1,200 miles, or 6,336,000 feet.