For a steel alloy it has been determined that a carburizing heat treatment of 5-h duration will raise the carbon concentration to 0.38 wt% at a point 1.2 mm from the surface. Estimate the time (in h) necessary to achieve the same concentration at a 5.4 mm position for an identical steel and at the same carburizing temperature.

answer:

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answer:

i am not 100% sure but i think it is a.)

dont take my word for it

explanation: