There are two identical vessels filled with equal amounts of ice. The vessels are of different metals., If the ice melts in the two vessels in $20$ and $35$ minutes respectively, the ratio of the coefficients of thermal conductivity of the two metals is

  • A

    $4:7$

  • B

    $7:4$

  • C

    $16:49$

  • D

    $49:16$

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