(Solution) - An aluminum pipe has a length of 60 m at -(2025 Original AI-Free Solution)

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An aluminum pipe has a length of 60 m at a temperature of 10°C. An adjacent steel pipe at the same temperature is 5 mm longer than the aluminum pipe.
At what temperature (degrees Celsius) will the aluminum pipe be 15 mm longer than the steel pipe? (Assume that the coefficients of thermal expansion of aluminum and steel are ?a = 23 × 106 / °C and ?s = 12 × 106/°C, respectively.)