Two spheres of different materials one with double the radius and one-fourth wall thickness of t...

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Two spheres of different materials one with double the radius and one-fourth wall thickness of the other, are filled
\( \mathrm{P} \) with ice. If the time taken for melting complete ice in the

W larger sphere is 25 minutes and that for smaller one is 16 minutes, the ratio of thermal conductivity of the material of larger sphere to that of the smaller sphere is
(1) \( 4: 5 \)
(2) \( 5: 4 \)
(3) \( 25: 1 \)
(4) \( 1: 25 \)
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