Question 566814
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Let *[tex \Large r] represent John's speed.  Then *[tex \Large r\ -\ 10] must represent the other guy's speed.


The time it takes John to go 390 miles is *[tex \Large \frac{390}{r}] and the time it takes the other guy to go 330 miles is *[tex \Large \frac{390}{r\ -\ 10}].  These two times are equal:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \frac{390}{r}\ =\ \frac{330}{r\ -\ 10}]


Solve for *[tex \Large r]


John
*[tex \LARGE e^{i\pi} + 1 = 0]
My calculator said it, I believe it, that settles it
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