Question 1137736
<pre>
              SPEED          TIME               DISTANCE

regular           r           {{{d/r}}}              d

faster            r+2        {{{d/(r+2)}}}           d

difference                   {{{1/4}}}
</pre>

{{{system(d/r-d/(r+2)=1/4,d=200)}}}
substitute for d, simplify, and solve for r.