A hot cylinder ingot of 50mm diameter and 200mm long is taken out from the fuatace at 800°C and dipped in water till its temperature fall to 500°C. Then, it is dırectly exposed to air till its temperature falls to 100°C. Find the total time required for the ingot to reach the temperature from 800°C to 100°C. Take the following k(thermal conductivity of ingot) = 60w/m°C: c(specific heat of ingot) = 200J/m°C; p(density of ingot material) = 800kg/m:

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