A cup of coffee cools from 90 C to 80 C in t minutes, when the room temperature is 20 C . The time taken by a similar cup of coffee to cool from 80 C to 60 C at a room temperature same at 20 C is

1. A. 13 5 t
2. B. 10 13 t
3. C. 5 13 t
4. D. 13 10 t

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