Due to mach speeds being the percentage of the speed of sound and the speed of sound changing with air density and temperature the answer varies but mach .95 at 30,000ft is 645.05 mph
Mach 889 is about 659,233 mph
Mach 6 is about 4,449.3 mph
1,750.8 mph
Mach 1 is about 762 mph, so mach 20 is about 15,240mph.
About 761 mph
about 655 MPH
Mach 1.7 is equal to about 1294 mph.
645.38104_MPH_">645.38104 MPH-is 0.87 Mach -
3044.83 mph
1534.54 mph
about 5100 mph
4567.24 mph