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A hot cylindrical ingot 50 mm in diameter and 200 mm in length is taken out of the oven at 800C to be immersed in

A hot cylindrical ingot 50 mm in diameter and 200 mm in length is taken out of the oven at 800°C to be immersed in water until its temperature reaches 500°C. Then it is directly exposed to the air until its temperature drops to 100°C. Find the total time required for an ingot to reach the temperature of 100°C (from 800 to 100°C)

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