1.

A cup of coffee cools from 90∘C to 80∘C in t mins, 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.

Answer»

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



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