<p>A <i>Unit Of Speed</i> measures <a href="http://www.freebase.com:80/view/guid/9202a8c04000641f8000000000038f1f">speed</a> or <a href="http://www.freebase.com:80/view/guid/9202a8c04000641f800000000003f5de">velocity</a>, the ratio of linear distance to time. All units should have their equivalent given in the <a href="http://www.freebase.com:80/view/guid/9202a8c04000641f800000000005846f">SI</a> base unit, <a href="http://www.freebase.com:80/view/guid/9202a8c04000641f800000000007d713">m/s</a>.</p>