Question 1143482
<pre>
              SPEED       TIME          DISTANCE

JOG              2r        9/(2r)          9

WALK             r        1.5/r            1.5

TOTAL                      2
</pre>


{{{9/(2r)+1.5/r=2}}}

-

{{{9/(2r)+3/(2r)=2}}}

{{{12/(2r)=2}}}

{{{2r/12=1/2}}}

{{{highlight(2r=6)}}}, {{{jogging}}}{{{speed}}}