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A small metal bar, whose initial temperature is 20 ℃, is dropped into a container containing...

A small metal bar, whose initial temperature is 20 ℃, is dropped into a container containing boiling water (at 100 ℃) and its temperature increases 2 ℃ in 1 second. Determine the temperature of the metal bar after 10 seconds. How much time should we spend for the sea slug temperature of 60 ℃?
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