Question 1125946
<pre>
                  SPEED        TIME       DISTANCE
PLANE              8r          {{{1050/(8r)}}}           1050
TRAIN               r          {{{1050/r}}}           1050
DIFFERENCE                     {{{8&3/4}}}
</pre>

{{{1050/r-1050/(8r)=8&3/4}}}

-

{{{120/r-120/(8r)=1}}}


{{{120/r-15/r=1}}}


{{{105/r=1}}}


{{{highlight(r=105)}}}