81.3 miles can't be expressed in hours. If it could, then you'd be able to figure out how many minutes high your house is, and how many miles of sleep you had last night.
With many thanks to another WA contributor who put his words to my thoughts.
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Miles do not convert to hours. Miles are length and hours is time.
the answer is 10.62 hours in 743 miles
hours are time, and miles are length
so many hours
How many hours is 265 miles