SOLUTION: Allison drove for 2 hours on the freeway, then decreased her speed by 20 miles per hour and drove 4 more hours on a country road. If her total trip was 268 miles, then what was her

Question 959053: Allison drove for 2 hours on the freeway, then decreased her speed by 20 miles per hour and drove 4 more hours on a country road. If her total trip was 268 miles, then what was her speed on the freeway?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Allison drove for 2 hours on the freeway, then decreased her speed by 20 miles per hour and drove 4 more hours on a country road. If her total trip was 268 miles, then what was her speed on the freeway?
---------------
Freeway DATA:
time = 2 hrs ; rate = r mph ; distance = 2r miles
-----
Country DATA:
time = 4 hrs ; rate = r-20 mph ; distance = 4r-80 miles
----------------------
Equations:
distance + distance = 268
2r + 4r-80 = 268
6r = 348
rate = 58 mph (rate on freeway)
----------------
Cheers,
Stan H.
------------
RELATED QUESTIONS
Tara drove 3 hours on the freeway, then decreased her speed by 20 miles per hour and... (answered by jorel1380)

Harry drove for 5 hours on the freeway, then decreased his speed by 20 miles per hour and (answered by josgarithmetic)

Harry drove for 4 hours on the freeway, then decreased his speed by 20 miles... (answered by Alan3354)

Harry drove for 2 hours on the freeway, then decreased his speed by 20 miles per... (answered by Boreal)

Harry drove for 2 hours on the freeway, then decreased his speed by 20 miles per (answered by josgarithmetic)

Harry drove for 5 hours on the freeway, then decreased his speed by 20 miles per... (answered by addingup,josgarithmetic)

Harry drove for 2hours on the freeway,then decreased his speed by 20miles per hour and... (answered by josgarithmetic)

Harry drove for 2 hours on the freeway, then decreased his speed by 20 miles per hour... (answered by ikleyn)

harry drove for 3 hours on the freeway then decreased his speed by 20 miles per hours,... (answered by stanbon)