Toyota Prius top speed: 180 km/hr
Most countries use the Metric System, which uses the measuring units such as meters and grams and adds prefixes like kilo, milli and centi to count orders of magnitude.
5 * 101 m/s (scientific)
50 m/s (engineering)
In the USA and UK, the older Imperial system is used, where things are measured in feet, inches and pounds.