About 2.3 feet per second.
45 kilometers/second (1 mile/1.609 kilometers)(5280 feet/1 mile) = 147,669 feet per second ===================
30 kilometers per hour = 27.34 feet per second.
i think that it is 694.44444 metres per second
1.26 kilometers is about 4,133.9 feet.
1,200 feet per second equates to 818.2 mph.
0.024384 kilometers per second
222 feet per second equates to 243.596 kilometers per hour.
(Feet per second x 1.1 = km/h). So, 500 fps x 1.1 = 550 kilometers per hour.
10,000km per hour is the same as 6,213.71 miles per hour.
60 kilometers (km) per hour is equal to about 54.7 feet per second.
A kilometre is a unit of distance. Feet per second is a unit of speed. The two units are therefore incompatible.