For a scientific experiment a physicist must make sure that the temperature of a metal 0°Cgets no colder than -80°C. The physicist changes the metals temperature at a steady rate of -4°C per hour. For

For a scientific experiment a physicist must make sure that the temperature of a metal 0°Cgets no colder than -80°C. The physicist changes the metals temperature at a steady rate of -4°C per hour. For how long can the physicist change the temperature?

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