the average speed f(t) (measured in kph) of traffic in a certain municipality between 4pm to 8pm on a typical weekday is approximated by the function f(t)= 20t-40\sqrt(t)+50, where 0 <=t<=4 and t is in hours. if t=0 happens at 4pm, determine the time at which the average speed of traffic flow is highest and lowest.

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