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If iron is kept at 1200K in a carburizing atmosphere for 8hrs to obtain a carbon concentration of 0.75 at a depth of 0.5mm.

If iron is kept at 1200K in a carburizing atmosphere for 8hrs to obtain a carbon concentration of 0.75 at a depth of 0.5mm. Find the time it would take to reach same carbon concentration at depth of 7.5mm at 1250K. (Given Do = 0.2x10 m/s & Q = 143kJ/mole/ K)

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