There are no "hours" in any distance.
If the question is really "How long would it take to travel 721 miles?" then the answer depends on the average speed, which depends on the mode of travel.
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how many is 260 miles
40 miles
At 60 miles per hour, six hours. At 30 miles per hour, twelve hours.
10 hours
960/70=13.7 hours or 13 hours 42.9minutes