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October 21, 2014

October 21, 2014

Posted by **debby** on Saturday, February 11, 2012 at 11:58am.

- algebra -
**Steve**, Saturday, February 11, 2012 at 4:31pmlet the speed be s

Add up the times:

60/s + 18/(s-5) = 3

s = (31+sqrt(561))/2 = 27.3 mph

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