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4. If the concentration of copper in aluminum at 400*C is 1.2 kg/m 2 mm from the surface after 2 hours, how long will it

4. If the concentration of copper in aluminum at 400*C is 1.2 kg/m 2 mm from the surface after 2 hours, how long will it take to reach the same concentration 12 mm from the surface if the temperature remains at 400'C

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