Distance = (speed) multiplied by (time)
Distance = (8 mile/hour) x (5 hours) = 40 miles.
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Assuming the question is asking for your speed in miles per hour (MPH) if you run 8 miles in 2 & 1/2 hours, divide miles by hours: 8 miles divided by 2 & 1/2 hours = 8 miles/2.5 hours = 8/2.5 MPH = 16/5 MPH = 3.2 MPH
5 hours
39 mph
Average speed was 65 mph. 100 miles + 420 miles = 520 miles 2 hours + 6 hours = 8 hours 520/8 = 65 mph
8 hours 13 minutes.