In Fig. 18-44a, two identical rectangular rods of metal are welded end to end, with a temperature of T₁ = 0°C on the left side and a temperature of T₂ = 100°C on the right side. In 2.0 min, 10 J is conducted at a constant rate from the right side to the left side. How much time would be required to conduct 10 J if the rods were welded side to side as in Fig. 18-44b?