SOLUTION: Benny left the city for vacation. Sally left 4 hours later going 70 mph faster to catch up. After 3 hours sally caught up. What was Benny’s average speed?

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Question 1108041: Benny left the city for vacation. Sally left 4 hours later going 70 mph faster to catch up. After 3 hours sally caught up. What was Benny’s average speed?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
               SPEED         TIME        DISTANCE
Benny             r          4+3=7         d
Sally            r+70         3            d

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

highlight_green%287r=3%28r%2B70%29%29
-
7r=3r%2B210
4r=210
highlight%28r=52%261%2F2%29--------Benny's speed