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) t 3 9t 2 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, an...

Traffic is moving fastest at 100 PM and 700 P ...

It is estimated that between the hours of noon and 7:00 P.M., the speed of highway traffic

Question:

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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