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Two rectangular blocks, having identical...

Two rectangular blocks, having identical dimensions can be arranged either in configuration-I or in configuration- Il as shown in the figure. 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 in both the configurations. It takes 9 s to transport a certain amount of heat from the hot and to the cold end in the configuration-I. The time to transport the same amount of heat in the configuration-II is

A

`2.0 s`

B

`3.0 s`

C

`4.5 s`

D

`6.0 s`

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