Question 279596
<pre>
              SPEED        TIME      DISTANCE

Pablo         5r           90/(5r)     90

Oscar          r           90/r        90

Difference                  4
</pre>
{{{highlight_green(90/r-90/(5r)=4)}}}



{{{45/r-45/(5r)=2}}}

{{{(5/5)(45/r)-45/(5r)=2}}}

{{{(4*45)/(5r)=2}}}

{{{36/r=2}}}

{{{18/r=1}}}

{{{highlight(r=18)}}}