340 feet/second equals 1,224,000 feet per hour or about 232 mph (231.8182).
From the calculation (340 x 3600)/5280 feet per mile
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Convert 3000 fps to mph
About 211.266 Mph.
about 2.5 mph 2.5 mph would be the correct answer had you asked how fast 5 KPH is in MPH, but that's not what you asked. While "mach" changes based on conditions of temperature, pressure, and elevation it's essentially the speed of sound. Roughly 340 m/sec. Doing the math from there, 340 * 5 = 1700 m/sec or 1.7 km/sec. Multiply by 60 for seconds and again by 60 for minutes and you get 1.7 km/sec * 60 seconds in a minute * 60 minutes in an hour = 6120 KMH.
It is 130 Feet per second.
340 miles / 4.2 hours = 80.95 MPH