If a 0.85km (at 0°C) section of a straight railroad track made of steel is assumed to behave as a single piece, what is the difference in the length of the track between a cold winter day (-12°C)and a hot summer day(+28°C)? The coefficient of linear expansion (α) of steel is 1.2 ×10-5°C-1.[1 km = 1,000 m]

If a 0.85km (at 0°C) section of a straight railroad track made of steel is assumed to behave as a single piece, what is the difference in the length of the track between a cold winter day (-12°C)and a hot summer day(+28°C)? The coefficient of linear expansion (α) of steel is 1.2 ×10-5°C-1.[1 km = 1,000 m]