To find the increase in the number of cars from 2 p.m. to 6 p.m., you can subtract the number of cars at 2 p.m. from the number of cars at 6 p.m.
Number of cars at 2 p.m. = 5,250
Number of cars at 6 p.m. = 6,250
Increase in number of cars = Number of cars at 6 p.m. - Number of cars at 2 p.m.
Increase in number of cars = 6,250 - 5,250 = 1,000
Therefore, the number of cars increased by 1,000 from 2 p.m. to 6 p.m.