Pathfinder Thermal Physics MCQ 27

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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. 27) Now the devices maintaining temperatures of pistons are removed and the pistons are covered with heat insulating materials. After a sufficient long time when a steady state is reached again, what will the distance between the pistons become ?