Question 1003763
Basic travel rates rule, RT=D


<pre>
            rate          time     distance
PAVED         r            4         ()
PASTURE       r-25        ()         ()
Total                     7         380
</pre>

Fill-in the cells
<pre>
            rate          time     distance
PAVED         r            4         r*4
PASTURE       r-25        3         (r-25)*3
Total                     7         380
</pre>

Solve using the sum of the distances.