(Solution) - A concrete driveway having a thickness of 18 cm attains -(2025 Original AI-Free Solution)

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A concrete driveway having a thickness of 18 cm attains an essentially uniform temperature of 30ºC on a warm November day in Texas. A "blue norther" arrives, which suddenly subjects the driveway to a convection boundary with h = 23 W/m2 · ºC and T? = 0ºC. How long will it take for the surface temperature of the driveway to drop to 5ºC? Work the problem two ways, using different assumptions.