The graph of the velocity (in km/h) of a car that is accelerating is shown in the figure, where t is measured in seconds. v (km/h) 80 60 40 20 t (seconds) 4 8 12 (a) Use the midpoint rule with n = 3 to estimate the average velocity vave (in km/h) of the car during the first 12 seconds. Vave km/h (b) At what time t (in s) was the instantaneous velocity equal to the average velocity? (Round your answer to one decimal place.) t =

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