Two vessels of different materials are similar in size in every res...

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Two vessels of different materials are similar in size in every respect. The same quantity of ice filled in them gets melted
\( \mathrm{P} \) in 20 minutes and 30 minutes. The ratio of their thermal conductivities will be
W
[MP PMT 1989; CMEET Bihar 1995; MP PET 2001]
(a) \( 1.5 \)
(b) 1
(c) \( 2 / 3 \)
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