Question 97136
distance / rate = time
Highway:
distance = 30
rate = x
time = 30 / x
Side Roads:
distance = 40
rate = x + 7
time = 40 / (x + 7)
Time were the same:
30 / x = 40 / (x + 7)
30(x + 7) = 40x
30x + 210 = 40x
210 = 10x
21 = x
What is the rate of speed on the side roads?
28 mph