Thermometry & Thermal Expansion question from MHT CET 2024 (2 May, Shift 1)

Railway track is made of steel segments separated by small gaps to allow for linear expansion. The segment of track is 10 m long when laid at temperature $17^\circ\text{C}$. The maximum temperature that can be reached is $45^\circ\text{C}$. Increase in length of the segment of railway track is ' $x$ ' $\times 10^{-5}\text{ m}$. The value of ' $x$ ' is $(\alpha$steel $= 1.2 \times 10^{-5}/^\circ\text{C})$