It is 2,727 MPH. And that's fast.
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15.0 feet per second is equivalent to: 10.23 miles per hour.
280 feet per second is 190.91 miles per hour.
293.2 miles per hour.
There are 5280 feet in one mile. Therefore in 4000 feet there are 4000/5280 miles. Cancel down by '10' Hence 400/528 Cancel down by ''8' 50/66 Cancel down by '2' 25/33 miles or in decimal 0.757575.... miles.
Best part of a mile, I think. 1,375 yards per mile.