Question 1133365
<pre>
Two cars going in same direction for same time
Separating at   {{{fastrate-slowrate}}} miles per hour

               SPEED        TIME       DISTANCE
SLOWCAR          r           3           3r
FASTCAR         2r           3           3*2r=6r
DIFFERENCE                               90
</pre>

{{{6r-3r=90}}}
-
{{{3r=90}}}
{{{highlight(r=30)}}}{{{mph}}}------slow car
-
Fast Car,  {{{highlight(60)}}} {{{mph}}}