# Math

posted by .

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

• Math -

His initial speed was 68mph. Using Distance = Rate * Time, we get:
Let r = speed for 6 hours,
r-20 = speed for 5 hours, so:
648 = 6r + 5*(r - 20).
Hope this wasn't in Wi because the max legal speed limit is 65mph!

• Math -

58

## Similar Questions

1. ### math

andys average driving speed for a 4-hour trip was 45 miles per hour. during the first 3 hours he drove 40 miles per hour. what was his average speed for the last hour of his trip?
2. ### math

Hannah took a trip yo visit her cousin. She drove 120 miles to reach her cousin's house and the same distance back home. a) It took her 1.2 hours to get halfway to her cousin's house. What was her average speed, in miles per hour, …
3. ### math

Lauren drove her car for 3 hours in a dust storm. When the skies cleared, she increased her speed by 30 miles per hour and drove 4 more hours, completing her 295-mile trip. How fast did she travel during the dust storm?

Carlos and maria drove a total of 258 miles in 5 hours. carlos drove the first part of the trip and averaged 50 miles per hour. maria drove the remainder of the trip and averaged 55 miles per hour. for approximately how many hours …
5. ### Math

Carlo drove for 3 hours in a fog, then increased his speed by 30 miles per hour (mph) and drove 6 more hours. If his total trip was 540 miles, then what was his speed in the fog.
6. ### math

harry drove for 4 hours on the freeway , he decreased his speed by 20 mph than drove for 5 hours on the country road. If his total trip was 449 miles, than what was his speed on the freeway
7. ### Algebra 1--Please, help me! (Steve)

Mulitiply. Simplify your answer. 1. 3r^2t/6st^3 x 2r^2s^3t^2/8r^4s^2 Add or subtract. Simplify your answer. 2. x^2 + x/x^2 + 3x + 2 + 3/x + 2 3. The Escobar family went on a car trip. They drove 100 miles on country roads and 240 miles …
8. ### math

Harry drove 4 hours on the freeway, then decreased his speed by 20 mph and drove for 2 more hours on a country road. if his total trip was 362 miles, then what was his speed on the freeway?
9. ### Math

Harry drove for 5 hours on the freeway, then decreased his speed by 20 miles per hour and drove for 3 more hours on a country road. If his trip total was 396 miles, then what was his speed on the freeway?
10. ### algebra

Harry drove for 6 hours on the freeway, then decreased his speed by 20 miles per hour and drove for 6 more hours on country road. If his total trip was 624 miles, then what was his speed on freeway?

More Similar Questions