Question 1067961
<pre>
               SPEED        TIME      DISTANCE

J to G          900-x        t          1000

G to J          900+x       {{{2&1/4}}}       1000
</pre>


{{{system((900-x)t=1000,(900+x)(2&1/4)=1000)}}}



You only need the return trip, second equation.  The J to G equation is not necessary.