Question 1142664
<pre>
               SPEED        TIME       DISTANCE

RUN            r           {{{30/r}}}             30

WALK          {{{r/12}}}        {{{1/(r/12)}}}               1

TOTAL                        7
</pre>

{{{highlight_green(30/r+12/r=7)}}}

-

{{{42/r=7}}}


{{{6/r=1}}}


{{{highlight(r=6)}}}