Dodge Tomahawk top speed: 564 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.
157 m/s
1.57 * 102 m/s (scientific)
156.67 m/s (engineering)
In the USA and UK, the older Imperial system is used, where things are measured in feet, inches and pounds.
564,000 m/hr
514 ft/sec
3,600 secs
1.0 hrs
3.6 * 103 sec(s)
60 min(s)
1 hr(s)
564,000 meter
1.85 * 106 ft
616.8 * 103 yard
564 * 103 m
564 km
350.45 mile
304.54 nautical mile