Question 185830
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If she would have gone 100 miles at 10 mph, then the total time must have been 10 hours, so if <i>t</i> is the amount of time she walked, 10 - <i>t</i> must be the amount of time she rode, so:

*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 84 = 10(10 - t) + 6t]

Solve for <i>t</i>

John
*[tex \LARGE e^{i\pi} + 1 = 0]
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