One end of a copper rod of length 1 .0 m and area of cross-section 10^-3 m² is immersed in boiling water and the other end in ice. If the coefficient of thermal conductivity of copper is 92 cal/m/s/°C and the latent heat of ice is 8 x 10⁴ cal /kg, then the amount of ice which will melt in one minute is

• A

  $9\cdot 2\times {10}^{-3}\mathrm{kg}$

• B

  $8\times {10}^{-3}\mathrm{kg}$

• C

  $6\cdot 9\times {10}^{-3}\mathrm{kg}$

• D

  $5\cdot 4\times {10}^{-3}\mathrm{kg}$