It is estimated that between the hours of noon and 7:00 PM, the speed of a highway traffic flowing past the intersection of EDSA and Ortigas Avenue is approximately S=t^ 3 -9t^ 2 + 15t + 45 kph, where t is the number of hours past noon. At what time between noon and 7:00 PM is the traffic moving fastest? 6:00 PM 5:00 PM 1:00 PM 4:00 PM

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