Question 995930
Eight hours away from home and 1 hour for lunch means total time traveling, 7 hours.


Let variables' meaning be implied in this table.
<pre>
                speed    time    distance
TO COUNTRY      40        c      40c
TO HOME         30        h      30h
Total                     7                         
<pre>This does not help.



Distance each way should be the same, some number d.
<pre> 
               speed   time       distance
TO COUNTRY      40      d/40       d
TO HOME         30      d/30       d
Total                   7
</pre>
This is more useful.
-
{{{highlight(d/40+d/30=7)}}}
Solve for d.