A brass rod and lead rod each 80 cm long at 0°C are clamped together at one end with their free ends coinciding. The separation of free ends of the rods if the system is placed in a steam bath is (αbᵣₐₛₛ =18 x 10⁻⁶ /°C and αₗₑₐd = 28 x 10⁻⁶ /°C )