SOLUTION: Willie left the hardware store and drove toward the town hall. Kathryn left one hour later driving 15mph faster in an effort to catch up to him. After two hours Kathryn finally c

Algebra ->  Graphs -> SOLUTION: Willie left the hardware store and drove toward the town hall. Kathryn left one hour later driving 15mph faster in an effort to catch up to him. After two hours Kathryn finally c      Log On


   

Question 1090275: Willie left the hardware store and drove toward the town hall. Kathryn left one hour later driving 15mph faster in an effort to catch up to him. After two hours Kathryn finally caught up. Find Willie's average speed.
show all work as you solve the problem and write complete answers including appropriate units.
Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
                   SPEED            TIME          DISTANCE
WILLIE              r               2+1            d
KATHRYN            r+15             2              d


Catch-up distance was equal for both of them. Kathryn's time given.

system%283r=d%2C2%28r%2B15%29=d%29

3r=2%28r%2B15%29
3r=2r%2B30
highlight%28r=30%29