21 kilometers per hour in feet per second

Conversion in the opposite direction

The inverse of the conversion factor is that 1 foot per second is equal to 0.0522514285714286 times 21 kilometers per hour.

It can also be expressed as: 21 kilometers per hour is equal to $\frac{1}{\mathrm{0.0522514285714286}}$ feet per second.

Approximation

An approximate numerical result would be: twenty-one kilometers per hour is about nineteen point one four feet per second, or alternatively, a foot per second is about zero point zero five times twenty-one kilometers per hour.