Question 1102955
<pre>
              SPEED     TIME     DISTANCE
JOG            2r       5/(2r)     5
WALK            r       2/r        2
TOTAL                    0.75
</ore>

{{{5/(2r)+2/r=0.75}}}

-

{{{5/(2r)+4/(2r)=0.75}}}

{{{9/(2r)=0.75}}}

{{{9=(3/4)2r}}}

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

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

{{{highlight(r=6)}}}---------walking speed
-
{{{highlight(12)}}}-----------jogging speed