SOLUTION: Harry drove for 3 hours on the freeway, then decreased his speed by 20 miles per hour and drove for 6 more hours on a country road, if his total trip was 492 miles, then what was h
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Question 1016939: Harry drove for 3 hours on the freeway, then decreased his speed by 20 miles per hour and drove for 6 more hours on a country road, if his total trip was 492 miles, then what was his speed on the freeway? Answer by Cromlix(4381) (Show Source):
You can put this solution on YOUR website! Hi there,
Make Harry's speed on freeway = x mph
Distance = Speed x Time
Freeway distance = 3x
Speed on country road = (x - 20)
Country road distance = 6(x - 20)
Freeway + Country road = 492 miles
3x + 6(x - 20) = 492
3x + 6x - 120 = 492
9x = 492 + 120
9x = 612
x = 612/9
x = 68mph
Speed on freeway = 68 mph
Speed on country road = 48 mph.
Hope this helps :-)
