If a metallic sphere gets cooled from \( 62^{\circ} \mathrm{C} \) t...

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If a metallic sphere gets cooled from \( 62^{\circ} \mathrm{C} \) to \( 50^{\circ} \mathrm{C} \) in 10 minutes and in the next 10 minutes gets cooled to \( 42^{\circ} \mathrm{C} \),
\( \mathrm{P} \) then the temperature of the surroundings is

W
[MP PET 1997; Kerala PMT 2007; KCET 2010;
Similar MP PET 1993; Kerala PET 2009; CBSE PMT 2014]
(a) \( 30^{\circ} \mathrm{C} \)
(b) \( 36^{\circ} \mathrm{C} \)
(c) \( 26^{\circ} \mathrm{C} \)
(d) \( 20^{\circ} \mathrm{C} \)
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