Question 1194916
<pre>
                   SPEEDS      TIMES      DISTANCES
firstracer          r+10          x          60
secondracer         r             x          45
</pre>
{{{x=x}}}

{{{system(x=60/(r+10),and,x=45/r)}}}


{{{60/(r+10)=45/r}}}


{{{4/(r+10)=3/r}}}


{{{4r=3(r+10)}}}


{{{4r=3r+30}}}


{{{highlight(r=30)}}}----------the speed for the second racer



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Look again at the variable and expression assigning!