Mach 1.6 = 1,217.9 mph
Mach 1 is about 762 mph, so mach 20 is about 15,240mph.
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
500 mph = 804.7 kph
889 mach is approximately 683,781.4 mph.
Mach 3 is 2283.6211 mph because Mach 1 equals 761.207033 mph.
Mach 4 is about 3,045 mph
Mach 10 = 7,612.07 mph
Mach 1.7 is about 1,260.6 mph
Mach 63 is about 46,717.3 mph
Mach 3 = 2283.6211 mph
1,750.8 mph
Mach 1.6 = 1,217.9 mph
Mach 6 is about 4,449.3 mph
Mach 0.8 = about 593.2 mph