Question 1203653
<pre>
                         SPEED         TIME hours    DISTANCE each way, miles

House to Office            25           L/25           L

Office to House            25+5=30      L/30           L

DIFFERENCE                              1/2
</pre>
{{{highlight_green(L/25-L/30=1/2)}}}

l.c.d., 2*5*5*3


{{{(2*3*5*5)(L/25-L/30)=(2*3*5*5)/2}}}

{{{6L-5L=75}}}

{{{highlight(L=75)}}}