Question 1141760
<pre>
           SPEED     TIMES     TIMES

WALK       w           1        0.5

RUN        r           2        2.5

DISTANCES             40       45
</pre>
{{{system(w+2r=40,w/2+2.5r=45)}}}


Multiply the "45" equation by 2:
{{{system(w+2r=40,w+5r=90)}}}


{{{E2-E1}}}
{{{3r=50}}}
{{{r=50/3}}}
{{{highlight(r=16&2/3)}}}


{{{w=40-2r}}}
{{{w=40-2(16&2/3)}}}
{{{40-32&4/3}}}
{{{40-33&1/3}}}
{{{highlight(w=6&2/3)}}}