Question 1111986
{{{(RATE)(TIME)=DISTANCE}}}

<pre>
              RATE      TIME     DISTANCE
GOING         35        d/35       d
RETURN        70        d/70       d
TOTAL                    6
</pre>


{{{d/35+d/70=6}}}-------solving this answers the question.

-

{{{2d/70+d/70=6}}}

{{{3d/70=6}}}

{{{d/70=2}}}

{{{d=140}}}