Question 1142664
To prepare for a marathon​ run, Sue ran 30 miles before she blistered her​ heel, and then she walked 1 additional mile. Her running speed was 12 times as fast as her walking speed. She was running and walking for 7 hours. Find​ Sue's running speed.
<pre>This is NOT NEARLY as complex as @josmiceli makes it. Plus, his walking speed of <b>4.298 is <u>WRONG</u></b>

It's a little more "INVOLVED" if I use S as the running speed, so I'll use S as the walking speed
Then running speed = 12S
We then get: {{{matrix(1,7, 30/(12S) + 1/S, "=", 7, "======>", 5/(2S) + 1/S, "=", 7)}}}
5 + 2 = 14S ------ Multiplying by LCD, 2S
7 = 14S
S, or walking speed = {{{matrix(1,4, 7/14, or, 1/2, mph)}}} 
Running speed: {{{highlight_green(matrix(1,4, 12 * (1/2), "=", 6, mph))}}}