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A metal sphere cools from 80°C to 60°C in 6 min. How much time with it take to cool from 60°C

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A metal sphere cools from 80°C to 60°C in 6 min. How much time with it take to cool from 60°C to 40°C if the room temperature is 30°C?

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Given : 

T1 = 80°C, T2 = 60°C, T3 = 40°C, T0 = 30°C, (dt)1 = 6 min.

To find : Time taken in cooling (dt)2 

Time taken in cooling is 10 min.

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