Question 1072531
RT=D, basic travel rate rule


<pre>
                 SPEED       TIME          DISTANCE
CYCLED            11         {{{(28-d)/11}}}     28-d
WALKED             5         {{{d/5}}}            d
Totals                        5             28
</pre>


d, the unknown distance walked.

{{{highlight_green((28-d)/11+d/5=5)}}}