Kagura stayed at Figaro and ordered a cup of Frappuccino. When the coffee was served at around 8:15 pm, its temperature is 75° Celsius. The temperature inside is maintained at 180 Celsius. At around 8:30, the temperature of the coffee dropped by 15º. What is the temperature of the coffee at exactly 8:40? If Kagura wants to drink the coffee when its temperature is 450 Celcius, at what time will this happen?

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