Pathfinder Thermal Physics MCQ 26

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Two heat conducting pistons can slide without friction in a horizontal pipe made of a heat insulating material. Distance between the pistons is 80.0 cm. The space between the pistons is completely filled with water.

Q.26) The left and the right pistons are maintained at constant temperatures -40 C and 16 C respectively. After a sufficient long time when a steady state is reached, what will the distance between the pistons become ?