You can not mix Time and Distance that way :-)
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If you are traveling 2 miles an hour, then 1 hour.
There is no way to answer the question as asked, because time (hours) and distance (miles) are not the same. If the question was phrased: How many hours were spent driving at 207 miles and the miles per hour were 55 mph, then the answer would be 3 hours and 45 minutes. Rephrase the question, give the miles per hour, and then the question can be answered.
3 hours 15 minutes is equal to 3 and a quarter hours.208 / 3.25 = 64 miles per hour.
"Hour" is a unit of time. "Mile" is a unit of length. They can never be equal, or converted one to the other. If they could, then you'd be able to calculate how many miles of sleep you got last night.
how many is 260 miles