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Please help? Steel balls 12mm in diameter are annealed by heating to 1200K and then slowly cooling to 420K in an air environment for which

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Steel balls 12mm in diameter are annealed by heating to 1200K and then slowly cooling to 420K in an air environment for which T=325 K and h=20W/m2K. Assuming the properties of the steel to be k= 40W/mK,=7800kg/m3, and c=600J/kgK, estimate the time required for the cooling process. The time required for the cooling process is h

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