Question 1134427
<pre>
                    SPEED         TIME        DISTANCE

NORMALLY            r             2.5          d

SNOWY WEATHER       r-10          3            d
</pre>

Question asks for d.


{{{system(2.5r=d,3(r-10)=d)}}}


{{{r=d/2.5}}}
-
{{{3(d/2.5-10)=d}}}
{{{d/2.5-10=d/3}}}
{{{d/2.5-d/3=10}}}
{{{d(1/2.5-1/3)=10}}}
{{{highlight(d=150)}}}