The temp at the mid point of the longer rod would

Question

Two rods, one of length L and the other of length 2L are made of the same material and have the same diameter. The two ends of the longer rod are maintained at 100⁰C. One end of the shorter rod is maintained at 100⁰C while the other end is insulated. Both the rods are exposed to the same environment at 40⁰C. The temp at the insulated end of the shorter rod is measured to be 55⁰C. The temp at the mid point of the longer rod would                                        

      (a) 44⁰C                                                              (b) 50⁰C

      (c) 55⁰C                                                              (d) 100⁰C