Question 1002067
<pre>
                rate           time         distance
part1            r              2            ( )
part2          r-25            ( )           ( )
totals                        {{{2&1/2}}}          125
</pre>

Fill the empty cells based on sums or RT=D.
<pre>
                rate           time                 distance
part1            r              2                    (2r)
part2          r-25            {{{2&1/2-2=1/2}}}           {{{(r-25)(1/2)}}}
totals                        {{{2&1/2}}}                  125
</pre>

Use the total distance sum to solve for r.
{{{highlight(2r+(r-25)(1/2)=125)}}}