Feet per second is both scalar and vector quantity. It measures the distance travelled in feet by the number of seconds. It is shortly called as ft/s, ft/sec, foot per second or fps. 1 feet per second is exactly equal to 1.09728 km/h. Kilometre per hour is the unit of speed. It is commonly used in the measurement of speed throughout the world. You can easily convert the values from Feet per second to Kilometer per hour using this online conversion calculator.
1FPS is equal to 1.09728 KPH.
Hence, 15ft/sec (foot per second) is equal to
= 15 x 1.09728
=16.4592 km/h(Kilometres Per Hour).