250 feet per second = 170.45 mph
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300 feet per second = 204.54 mph
250 km per hour = 0.04315 miles per second.
15.0 feet per second is equivalent to: 10.23 miles per hour.
It is 2,727 MPH. And that's fast.
it is 180 feet per second. 90 feet per half a second. 45 feet per quarter second. in other words, it traveles about a mile in 32 seconds.