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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.
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