Question 1151459
<pre>
                  SPEED           TIME         DISTANCE

GOING              30             d/30          d

RETURN              6             d/6           d

TOTAL                           {{{3/4}}}
</pre>

45 minutes is three-fourths of an hour.


{{{d/30+d/6=3/4}}}

-

{{{60(d/30+d/6)=60(3/4)}}}

{{{2d+10d=45}}}

{{{12d=45}}}

{{{d=45/12=(3*15)/(3*4)}}}

{{{d=15/4}}}

{{{highlight(d=3&3/4)}}}