Question 987555
<pre>
             speed        time          distance
FAST          75        {{{1&2/3}}}           {{{d[f]}}}
SLOWER         r        {{{t[s]}}}            {{{d[s]}}}
Totals                  {{{2&1/2}}}             185
</pre>


Four variables but not nearly as bad as it appears.


{{{d[f]=75*(5/3)=125}}}
and
{{{t[s]=2&1/2-1&2/3=5/2-5/3=(15-10)/6=5/6}}}
and then
{{{d[s]=185-d[f]=185-125=60}}}


You should be able to find r.