299 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.
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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