Question 1101073
<pre>
                SPEED       TIME    DISTANCE
THEOTHER           r         9
FIRST             3r/2       9
DIFFERENCE                                387
</pre>


{{{9(3/2)r-9r=387}}}

-

{{{3r/2-r=43}}}

{{{r/2=43}}}

{{{highlight(r=86)}}}-------second plane