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December 22, 2014

December 22, 2014

Posted by **Lilia** on Monday, July 25, 2011 at 12:03am.

- Math -
**Mithra**, Monday, July 25, 2011 at 11:16amSpeed = distance / time

20 minutes = 20/60 = 1/3 hr

Speed = 40 miles / (1/3) hr

Speed = 120 mp/h

Hence, his average speed returned home is 120 mile per hour.

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