428 kilometers per hour in feet per second
Conversion
428 kilometers per hour is equivalent to 390.055409740449 feet per second.[1]
Conversion in the opposite direction
The inverse of the conversion factor is that 1 foot per second is equal to 0.00256373831775701 times 428 kilometers per hour.
It can also be expressed as: 428 kilometers per hour is equal to feet per second.
Approximation
An approximate numerical result would be: four hundred and twenty-eight kilometers per hour is about three hundred and ninety point zero six feet per second, or alternatively, a foot per second is about zero times four hundred and twenty-eight kilometers per hour.
Footnotes
[1] The precision is 15 significant digits (fourteen digits to the right of the decimal point).
Results may contain small errors due to the use of floating point arithmetic.