Posted by Nerd101 on Tuesday, February 15, 2011 at 4:03am.
Average speed = total distance/total time
time for first leg = 8/5 hrs
time for 2nd leg = 2/7 hours
total time = 8/5 + 2/7 or 66/35
avg speed = 10/(66/35) = 10(35/66) = 5.3 mph
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