ExpressionVisible detailQaliqat riḥālatuhāThe saddle shifts with rapid runningAsbala naḥruhāSweat streams down the neckIbtalla ... ḥizāmuhāThe girth becomes soaked with frothy sweat
None gives a numerical speed. Instead the mount’s sustained exertion is shown through visible consequences, allowing the reader to infer how hard and fast it has travelled.