Question 1091837
<pre>
                   SPEED          TIME         DISTANCE

GOING               r              7             d

RETURN             r+27            4             d

</pre>


{{{7r=4(r+27)}}}
{{{7r=4r+108}}}
{{{3r=108}}}
{{{r=36}}}
-

{{{36*7=highlight(252)}}}----------miles distance from the mountains