Question 1081730
t, biking time
w, walking speed

<pre>
                 SPEED        TIME        DISTANCE
BICYCLING        w+9           t           6
WALKING           w           t+3/2        6
</pre>





Another way:
<pre>
                 SPEED        TIME        DISTANCE
BICYCLING        w+9           6/(w+9)     6
WALKING           w           6/w          6
DIFFERENCE                    3/2
</pre>

This way allows equation in just w, only using the time difference.
{{{highlight(6/w-6/(w+9)=3/2)}}}