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?
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!
58
To find Harry's speed on the freeway, we can use the formula: Speed = Distance / Time.
Let's first calculate the distance Harry traveled on the freeway. We know he drove for 6 hours, so we'll multiply his speed by the time spent to calculate the distance covered.
Let's say his speed on the freeway is represented by 'x'. Therefore, the distance he traveled on the freeway is 6x.
Next, we'll calculate the distance he traveled on the country road. We know he drove for 5 hours with a reduced speed of 20 miles per hour. So, his speed on the country road would be (x - 20) mph. Therefore, the distance he traveled on the country road is (5 * (x - 20)).
Now, we can set up an equation to represent the total distance of his trip:
6x + 5(x - 20) = 648
Let's solve for x:
6x + 5x - 100 = 648
11x = 748
x = 68
Therefore, Harry's speed on the freeway was 68 miles per hour.