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December 18, 2014

December 18, 2014

Posted by **val** on Tuesday, December 4, 2012 at 2:21pm.

- math -
**Steve**, Tuesday, December 4, 2012 at 2:50pmtime = distance/speed

since the times are the same,

2160/(s+30) = 1920/(s-30)

s = 510 mph

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