Temperature difference of 120°C is maintained between two ends of a uniform rod AB of length 2L. Another bent rod PQ, of same cross-section as AB and length $3L\over2$, is connected across AB (See figure). In steady state, temperature difference between P and Q will be close to :
(1) 60ºC
(2) 75ºC
(3) 35ºC
(4) 45ºC