Two rods one of length L and the other of length 2 L are made of the same material and have the same diameter. The two ends of the longer rod are maintained at 100°C. One end of the shorter rod is maintained at 100°C while the other end is insulated. Both the rod are exposed to the same environment at 40°C. The temperature at the insulated end of the shorter rod is measured to be 55°C. The temperature at the midpoint of the longer rod would be

• A. 40°C
• B. 50°C
• C. 55°C
• D. 100°C