Let us calculate the expansion in length of the three sections.
If the initial length of the section is "L_0" then the final length will be (see https://x-engineer.org/undergraduate-engineering/physics/thermodynamics/calculate-thermal-expansion/)
"L=L_0(1+\\alpha\\Delta T)" . The coefficient "\\alpha" of linear thermal expansion is "13\\cdot10^{-6}\\,\\mathrm{\/^\\circ C}" (see https://www.engineeringtoolbox.com/linear-expansion-coefficients-d_95.html), therefore the final length of one section will be
"2.4\\,\\mathrm{m}\\cdot(1+13\\cdot10^{-6}\\cdot32^\\circ\\mathrm{C}) = 2.4\\,\\mathrm{m} + 1\\,\\mathrm{mm}." Therefore, the increase of length of one section is 1 mm. Three section will increase the total length by 3 mm, therefore the total length of two gaps should be equal or greater than 3 mm, so the every gap should be equal or greater than 1.5 mm.
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