A $5cm$ thick ice block is there on the surface of water in a lake. The temperature of air is $-10°C$ ; how much time it will take to double the thickness of the block ......  hour ($L = 80 cal/g, Kicc = 0.004 Erg/s-k, dice = 0.92 g cm^{-3}$)

  • A

    $1$

  • B

    $191$

  • C

    $19.1$

  • D

    $1.91$

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  • [AIIMS 1998]