Mercedes rode her skateboard at a speed of 20 miles per hour. Which statement is correct? If she covered 4 miles, she rode for 5 hours.
If she covered 40 miles, she rode for 2 hours.
If she covered 10 miles, she rode for 0.25 hours.
If she covered 4 miles, she rode for .15 hours.

Which of these is not a criticism of the concentric zone model? it does not accurately describe cities after the rise of suburban development. it only applies to cities that grew after the development of the automobile. it assumes that inner-city areas will always be repurposed instead of abandoned. it places too much importance on the traditional central business district.