A slice of Ampalaya cake is removed from an oven at 210 °F and left to cool at room temperature, which is 70 °F. After 30 min the temperature of the cake is 140 °F. Assuming that Newton's Law of cooling applies in this scenario, what is the cooling constant k for the cake? From the time the Ampalaya cake is removed from the oven, when will the cake's temperature reach 100°F?

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