Question 1145797
..., Brayden drives 20 miles PER HOUR faster from Brightside to C-town than ,...


<pre>
              SPEED       TIME           DISTANCE

A to B           r          90/r             90

B to C          r+20       120/(r+20)       120

TOTAL                       7.5
</pre>

Simplify and solve:  {{{90/r+120/(r+20)=7.5}}}.


{{{12/r+16/(r+20)=1}}}


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