选择题
2022 AMC 8 Problem 9: Cooling Water
A cup of boiling water (212°F) is placed to cool in a room whose temperature remains constant at 68°F. Suppose the difference between the water temperature and the room temperature is halved every 5 minutes. What is the water temperature, in degrees Fahrenheit, after 15 minutes?
2022 AMC 8 第9题：冷却水
将一杯沸水 (212°F) 放置在温度恒定在 68°F 的房间中进行冷却。假设水温与室温之间的差异每 5 分钟减半。 15 分钟后的水温是多少（华氏度）
A.
77
B.
86
C.
92
D.
98
E.
104