Weight loss. If your cat is overweight, you will want to feed for 2 pounds less, or 40 fewer calories a day, and readjust every time your cat loses a pound, until you hit a healthy weight, and then maintain.  Differences in metabolism.
Since the speed of sound through the standard atmosphere is 761 mph (1,223 km/h) at sea level, Mach 2 then follows as 1,522 mph (2,447 km/h). If you were to ask how fast is Mach 2 at an altitude of 30,000 ft (9,150 m), we would use the same methodology to find out that it is only 1,356 mph (2,180 km/h) because the speed of sound generally decreases as altitude increases.
I know superman can go at least Mach 4, Which is 4 times the speed of sound(4 * 330 = 1320 meters / second) 1320 m/s = 2953 mph. Can Flash run faster than the speed of light, which is (3 00000000 meters / second)? speed of light in mph = 671 080 888 mph.