The expressions for the vapour pressure of the solid phase (p1) and liquid phase (p2) of a pure substance, respectively, are given by ln p1 = -2000/T + 5 and ln p2 = -4000/T + 10. The triple point temperature of this substance is:

For a spontaneous process occurring at constant temperature and pressure, the changes in Gibbs free energy (ΔG) and entropy (ΔS) satisfy:

For a phase reaction A ⇌ B, the standard Gibbs free energy change is given by ΔG° = 105 - 35 log10 T (in J mol-1). Find the transition temperature (in °C) of the reaction at 1 bar pressure.