



 
Hi Jean, An hour is 60 minutes and 60 divided by 4 is 15 so it takes 15, 4minute intervals to make an hour. In each of these 4 minute intervals you need to go 3.1 miles and hence in an hour you will go $15 \times 3.1 = 46.5$ miles. Hence you will need to travel at 46.5 miles per hour. Cheers, 



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