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
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-> 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
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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
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Equation for freeway:
(1)
Equation for country road:
(2)
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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
