The area of the glass of a window of a room is $10\;{m^2}$ and thickness $2mm$. The outer and inner temperature are ${40^o}C$ and ${20^o}C$ respectively. Thermal conductivity of glass in $MKS$ system is $0.2$. The heat flowing in the room per second will be

  • A

    $3 \times {10^4}\;joules$

  • B

    $2 \times {10^4}\;joules$

  • C

    $30$ joules

  • D

    $45$ joules

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