fractions with SI units package

Question

Hey I'm trying to display the fraction of:

But I'm not sure how to do it with the siunitx package.
This is what I got so far: \SI[quotient-mode=fraction]{16 2/3}{\metre\per\second}
But the result is not correct:

What am I missing?

Answer 1

The parser in siunitx does not attempt to 'read' fractions in the way you want: it ignores spaces so parses as 162/3. If you want manual formatting, you'll need to turn off the parser

\SI[quotient-mode=fraction,parse-numbers=false]{16\frac{2}{3}}{\metre\per\second}