1335 kmph
3675 KPH
18 kph is approximately equal to 11.2 mph.
1790
18 mph = 29 kph
612.5 meters per sec
Mach I (the Speed of Sound) is approximately 1,236 km/h (738 mp/h). This is dependent on the air pressure. At sea level, the speed of sound is about 760 mph; at high altitude it reduces closer to 600 mph.
500 mph = 804.7 kph
18 kph
Mach 1.8 or about 1,190 mph.
Mach 3, sounds good.728 knots
Mach 1.8 (1200mph)
Mach 1.8 (1200mph)