Question 1208126
<pre>
            SPEED              TIME                   DISTANCE in kilometers

WALK          6                {{{d/6}}}                  d

BIKE         20               {{{d/20}}}                  d

Total                         {{{39/60}}}
</pre>
d, the unknown distance each way
Total time as hours, is {{{39/60}}}, and seems more convenient not to reduce this.


{{{highlight_green(d/6+d/20=39/60)}}}



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(Yes, you can do this all in symbols if you want to.)