Explanation

This is the same as m/km. ' It further provides an example: '3m/4km = 0. 75m/km' and then shows that to convert this to per mille, one must multiply by 1000 (or use the relationship derived from $1 ext{ km} = 1000 ext{ m}$ which leads to $ rac{ ext{Rise}}{ ext{Run}} imes 1000$ if Rise and Run are in meters and kilometers respectively, or simply recognizing that $m/km$ is equivalent to per mille). The calculation shown in the text for a similar concept (though using different numbers) confirms this relationship: '0. 75 m/km $ imes$ (1 km / 1000 m) = 0. 00075' and then '0. 00075 x 1000 = 750‰'. Therefore, $0. 75 ext{ m/km}$ is equivalent to $750 ext{‰}$.