Question 1108041
<pre>
               SPEED         TIME        DISTANCE
Benny             r          4+3=7         d
Sally            r+70         3            d
</pre>

Distance not given but is same for both Benny and for Sally.


{{{highlight_green(7r=3(r+70))}}}

-

{{{7r=3r+210}}}
{{{4r=210}}}
{{{highlight(r=52&1/2)}}}--------Benny's speed