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?
since distance = speed * time,
6x + 6(x-20) = 624
62
To find Harry's speed on the freeway, we can set up an equation based on the information given.
Let's assume Harry's speed on the freeway was x miles per hour.
So, in the first 6 hours on the freeway, he traveled a distance of 6x miles.
Afterward, he decreased his speed by 20 miles per hour, so his speed on the country road was (x - 20) miles per hour.
In the next 6 hours on the country road, he traveled a distance of 6(x - 20) miles.
According to the given information, his total trip distance was 624 miles.
Therefore, we can write the equation:
6x + 6(x - 20) = 624
Simplifying the equation:
6x + 6x - 120 = 624
12x = 744
Dividing both sides by 12:
x = 62
So, Harry's speed on the freeway was 62 miles per hour.