Answer: 65 km/h = 40.3891 mph
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roughly MPH X 1.609
You must make a formula and convert the units to solve this problem. 65 miles per hour is a speed. 850 miles is a length. If you are travelling at 65 miles per hour, then you will have traveled 65 for every hour. At this point, it becomes a simple division problem. 850 miles covered at 65 miles per hour is 850 miles/65 miles/hour. 850/65 = ~13. The miles on the top and bottom of the fraction cancel out, and you are left with hours. So the time taken will be ~13 hours.
The following is the answer.
65 miles per hour x 4 hours = 260 miles
If you went exactly at 65 miles per hour, it would take 628/65 hours or 9 and 3/5 of an hour.