TRAFFIC CONTROL It is estimated that between the hours of noon and 7:00 p.m., the speed of highway traffic flowing past a certain downtown exit is approximately
S(t) = t3 – 9t2 + 15t + 45
miles per hour, where t is the number of hours past noon. At what time between noon and 7:00 p.m. is the traffic moving the fastest, and at what time between noon and 7:00 p.m. is it moving the slowest?
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