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On a mild Saturday morning while people are working​ inside, the furnace keeps the temperature inside...

On a mild Saturday morning while people are working​ inside, the furnace keeps the temperature inside the building at 21 degreesC. At noon the furnace is turned​ off, and the people go home. The temperature outside is a constant 9degreesC for the rest of the afternoon. If the time constant for the building is 3 ​hr, when will the temperature inside the building reach 14degrees​C? If some windows are left open and the time constant drops to 2 ​hr, when will the temperature inside reach 14degrees​C?
If the time constant for the building is 3 ​hr, the temperature inside the building will reach 14degreesC about
nothing hr after noon.
​(Round to the nearest tenth as​ needed.)

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