The temperature \( T(t) \) of a body a time \( t = 0 \) is \( 160^\circ F \) and it decreases continuously as per the differential equation \( \dfrac{dT}{dt} = -K (T - 80) \), where \( K \) is a positive constant. If \( T(15) = 120^\circ F \), then \( T(45) \) is equal to:
