Mach 10 is approximately 7,410 miles per hour. This is equivalent to 11,908 kilometers per hour, 10,893 feet per second, or 3,320 meters per second. The Mach number is the ratio of the speed of a given object to the local speed of sound. Mach 1 is equal to the speed of sound, which is approximately 767 miles per hour on a typical day at sea level with a temperature of 68°F (20°C) . Therefore, Mach 10 is 10 times the speed of sound.