Daily production levels in a plant can be modeled by the function $G(t)=-3 t^{2}$$+18t-9$ , which gives units produced t hours after the factory opened at 8am.At what time during the day is factory productivity a maximum? Answer in the form "_:_ _" (without an "am" or "pm").

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The Answer of Daily production levels in a plant can be modeled by the function $G(t)=-3 t^{2}$$+18t-9$ , which gives units produced t hours after the factory opened at 8am.At what time during the day is factory productivity a maximum? Answer in the form "_:_ _" (without an "am" or "pm").

Daily Production Levels in a Plant Can Be Modeled by the Function