@writeaway
Not sure why the quotation marks. Of course, the official SI unit is km/h. Neither kph nor kmph is wrong, though. But if at all, I'm used to seeing "kph" (e.g.,
https://www.nps.gov/yell/learn/management/upload/Draft_Sound... ), which is why I said "recommend."
Most of the additional posts I made were in reference to comments on the suggested answer. Actually, your comment was the only helpful one.
@herbalchemist
No, 100 km/h is the speed limit on certain freeway-style highways that are not "Autobahnen." But writeaway and Lancashireman are right that this may be of little consequence here.