SOLUTION: harry drove for 3 hours on the freeway, then decreased his speed by 20 miles per hour and drove for 3 more hours on the country road, if his total speed was 306 then that was his s

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Question 1017296: harry drove for 3 hours on the freeway, then decreased his speed by 20 miles per hour and drove for 3 more hours on the country road, if his total speed was 306 then that was his speed on the freeway
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
                   speed     time
freeway            r         3
country            r-20      3
TOTAL              306

The description is very strange. "Total speed".
r%2B%28r-20%29=306
r%2Br-20=306
2r-20=306
r-10=153
highlight%28highlight%28r=163%29%29------The freeway speed, so the country road speed was highlight%28r-20=143%29.