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 483 miles, then what was his speed on the freeway?

Question

Cassius Poole

Mathematics

7 December, 22:29

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 483 miles, then what was his speed on the freeway?

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Answers (1)

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Guillermo Berry · Answer 1

Х (miles per hour) - his speed

3x + (x - 20) * 6 = 483

3x + 6x - 120 = 483

9x - 120 = 483

9x = 483 + 120

9x = 603

x = 603 : 9

х = 67 miles per hour - his speed on the freeway - answer.