Mach 500 = 380 603.525 mph
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Mach 1.6 = 1,217.9 mph
Mach 20 is 20 times the speed of sound, which is approximately 767 mph at sea level and room temperature. Therefore, Mach 20 would be 20 x 767 mph, which equals 15,340 mph. This speed is extremely fast and is typically associated with hypersonic flight and reentry vehicles.
From the Earth to the Sun 75 MPH 160 years 500 MPH 24 years 1350 MPH (mach 2) 8.8 years 40,000 MPH (Voyager speed) 4 months
The Mach number for speed is a function of how fast an object is going relative to the speed of sound in that medium (which can vary). The speed of sound at sea level is around 768 mph, so Mach 3.3 at around this level will be 768 x 3.3 = 2534 mph
mach 1 = 761.207 mph, so 761.207 * 0.791 = 602.115 mph