Question 1072084
<pre>
                    SPEED      TIME      DISTANCE
BIKE                 13         x          13x
WALK                  4        7-x        4(7-x)
Total                           7          64
</pre>

{{{13x+4(7-x)=64}}}, starting equation



{{{13x+28-4x=64}}}

{{{9x=64-28}}}

{{{9x=36}}}

{{{highlight(x=4)}}}-----hours on bicycle

{{{7-4=highlight(3)}}}------hours walked