Question 1038783
Choose to handle time quantities instead of points on a time line.

<pre>
                  SPEED      TIME      DISTANCE
traveler A         60         4+3        d
traveler B         r           4         d
</pre>


Follow the description and examine how the data table matches.


{{{system((60)(7)=d,(r)(4)=d)}}}


{{{420=4r}}}  because the two expressions for d are equal.


{{{r=21*2*2*5/(2*2)}}}


{{{highlight(r=105)}}}