Thursday

July 24, 2014

July 24, 2014

Posted by **Audrey** on Sunday, June 17, 2007 at 3:12pm.

Let X = running rate, so X +20 = cycling rate.

Since rate = miles/time, then time = miles/rate. Since the time for both is the same:

12/X = 72/(X + 20)

You should be able to take it from here.

I hope this helps. Thanks for asking.

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