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Posted by **Nerd101** on Tuesday, February 15, 2011 at 4:03am.

- Math -
**Reiny**, Tuesday, February 15, 2011 at 10:07amAverage 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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