Carol drove for 2 hours on a two-lane state road. She then increased her speed by 20 miles per hour on the freeway and drove for 6 more hours. If the total trip was 480 miles, then what was her speed on the freeway?
A) 60 mph
B) 65 mph
C) 45 mph
D) 67 mph

Question

Quizplus · Accepted Answer

Let x be Carol's speed on the two-lane state road. Then, we can write:
2x + 6(x+20) = 480
Simplifying and solving for x, we get:
8x + 120 = 480
8x = 360
x = 45
Therefore, Carol's speed on the freeway was: x+20 = 45+20 = 65 mph.

Carol Drove for 2 Hours on a Two-Lane State Road