Two identical rods AC and CB made of two different metals having thermal conductivities in the ratio 2 : 3 are kept in contact with each other at the end C.as shown in the Fig. A is at 100°C and B is at 25°C. Then the junction C is at :
 

• A

  55°C

• B

  60°C

• C

  75°C

• D

  50°C