jim can run 5 MPH on level ground. on windy day he runs 13 miles with the wind and 7 miles against the wind what is the rate of the wind?

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So Jim's rate is 5, let's call the wind's rate w.  This gives us a system of two equations using d=rt:13 = (5+w)*t7   =(5-w)*tSo with this we can use our knowledge of how to solve a system of equations to find w.