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March 3, 2015

March 3, 2015

Posted by **Lee** on Monday, August 9, 2010 at 8:36am.

- math -
**Reiny**, Monday, August 9, 2010 at 8:42amtime for first trip = x/10

time for second trip = x/8

total time = x/10 + x/8

avg rate = total distance/total time

= 2x/(x/10 + x/8)

simplify, your x's should cancel out.

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