The average speed f(t) (measured in kph) of traffic in a certain municipality bet ween 4PM ... and 8PM on a typical weekday is approximated by the function: f(t) = 20t – 40/E + 50, where 0sts 4 and t is in hours. Assuming that t = 0 happens at 4PM, determine the time at which the average speed of traffic is highest and lowest.

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