Question 1024586
Rate, time, distance related in RT=D, the basic travel rate rule.


<pre>
            rate        time           distance

WALK         r           2             {{{highlight_green((r)(2))}}}

RUN         3r           {{{1/2}}}         {{{highlight_green((3r)(1/2))}}}

Total                                    21.7
</pre>

Sum of the distances gives the equation to solve.