To find the average speed, we divide the total distance traveled by the total time taken.
For the first route, the average speed is given by: 400 miles / 8 hours = 50 mph.
For the second route, the average speed is given by: 420 miles / 7 hours = 60 mph.
Therefore, the average speed on the faster route is 60 mph, and the average speed on the slower route is 50 mph.
The difference between the two average speeds is therefore 60 mph - 50 mph = 10 mph.
Therefore, the correct answer is C. 10 mph.
You are going to drive to another state for a vacation. One route will take 8 hours to drive 400 miles, and the other route will take 7 hours to drive 420 miles. You write two equations to try and figure out the average rate of speed you would travel on each route. How much higher will your average speed be on the faster route?
A. 50 mph
B. 20 mph
C. 10 mph
D. 60 mph
1 answer
1 answer