Question

Two cars raced at a race track. The faster car traveled 20 mph faster than the slower car. In the time that the slower car traveled 165 miles, the faster car traveled 225 miles. If the speeds of the cars remained constant, how fast did the slower car travel during the race?

A. 55 mph
B. 60 mph
C. 75 mph
D. 130 mph

Answer 1

165/r = 225/(r + 20)

225r = 165(r + 20)

225r = 165r + 3,300

60r = 3,300

r = 55 mph

The speed of the slower car was 55 mph.

The correct answer is A.