SOLUTION: Harry drove for 6 hours on the freeway, then decreased his speed by 20 miles per hour and drove for 5 more hours on a country road. If his total trip was 637 miles then what was hi

Question 851321: Harry drove for 6 hours on the freeway, then decreased his speed by 20 miles per hour and drove for 5 more hours on a country road. If his total trip was 637 miles then what was his speed on the freeway?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = distance driven on the freeway in miles
Let = Harry's speed on freeway in mi/hr
= distance driven on country road
= Harry's speed on country road
-------------------
Equation for freeway:
(1)
Equation for country road:
(2)
---------------------------
Substitute (1) into (2)
(2)
(2)
(2)
(2)
Harry's speed on freeway was 67 mi/hr
check:
(1)
(1)
(1)
and
(2)
(2)
(2)
(2)
OK

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