speed
A speed. Accepts any of:
"<real>mph"— miles per hour;"<real>kph"— kilometres per hour;"<real>m/s"— metres per second;- a bare
<real>— interpreted as metres per second.
A speed. Accepts any of:
"<real>mph" — miles per hour;"<real>kph" — kilometres per hour;"<real>m/s" — metres per second;<real> — interpreted as metres per second.