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October 20, 2014

October 20, 2014

Posted by **donna** on Sunday, March 7, 2010 at 10:14pm.

- math -
**Reiny**, Sunday, March 7, 2010 at 10:50pmtime for first trip = 100/48 hours = 25/12 hrs

time for return trip = 100/40 = 5/2 hours

total time = 5/2 + 25/12 hours = 55/12 hrs

avg speed = total distance / total time

= 200/(55/12) = 43.64 mph

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