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Two rectangular blocks, having identical dimensions, can be arranged either in configuration I or in configuration II as shown. One of the blocks has thermal conductivity K and the other 2K. The temperature difference between the ends along the x-axis is the same for both configurations. It takes 9 seconds to transport a certain amount of heat in configuration I. The time to transport the same amount of heat in configuration II is:
A) 2.0 sec
B) 3.0 sec
C) 4.5 sec
D) 6.0 sec

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