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19.14 A transportation engineering study requires that you determine the number of cars that pass through an intersec- tion traveling during morning rush hour. You stand at the side of the road and count the number of cars that pass every 4 minutes at several times as tabulated below. Use the best numerical method to determine (a) the total number of cars that pass between 7:30 and 9:15 and (b) the rate of cars going through the intersection per minute. (Hint: Be careful with units.) Time (hr) Rate (cars 7:30 7:45 8:00 8:15 8:45 9:15 per 4 min) 18 23 14 24 20 9 19.14 A transportation engineering study requires that you determine the number of cars that pass through an intersec- tion traveling during morning rush hour. You stand at the side of the road and count the number of cars that pass every 4 minutes at several times as tabulated below. Use the best numerical method to determine (a) the total number of cars that pass between 7:30 and 9:15 and (b) the rate of cars going through the intersection per minute. (Hint: Be careful with units.) Time (hr) Rate (cars 7:30 7:45 8:00 8:15 8:45 9:15 per 4 min) 18 23 14 24 20 9