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Doing it your way, by saying that you can see 8 miles is ten percent of 80mph, so must be 10 percent of 60 minutes = 6 minutes: To find how long for 17 miles, work out what percentage 17 is of 80: 17/80 * 100 = 21.25% Then 21.25% of 60 minutes = 12.75 minutes.