AT THE RATE OF

Dutch

telkens (an, each time, every time, per), ieder (each, every), elk (each, every), bý (an, at, bee, beside, by, by means of, during, for, near, near to, nearby, next to, on, per, through, to, toward, towards, whereas, while, whilst, with), à (an, per). (various references)

Esperanto

po (at, by). (various references)

Finnish

kohti (a, an, per, perpendicular, vertical). (various references)

French

par. (various references)

German

zu (at, to, too, for, toward, towards, closed, in, into, on, shut, with), mit der Geschwindigkeit von, je (ever, per), à (a, an, per). (various references)

Hungarian

vmilyen sebességgel. (various references)

Pig Latin

atay ethay ateray ofay.(various references)

Polish

po (a, an, per). (various references)

Portuguese

à taxa de, à razão de. (various references)

Russian 

со скоростью; в размере. (various references)