The metric and "SI" unit of speed or velocity. One meter per second is equal to exactly 3.6 kilometers per hour (km/h) or about 2.236 936 miles per hour or 3.280 840 feet per second
Russ Rowlett (Director), How Many? A Dictionary of Units of Measurement, Center for Mathematics and Science Education University of North Carolina, USA 2005. http://www.unc.edu/~rowlett/units/dictA.html, (Unit of Meas and Covr Factors - Amer) {608}