Certain quantity of water cools from \( 70^{\circ} \mathrm{C} \) to \( 60^{\circ} \mathrm{C} \) ...

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Certain quantity of water cools from \( 70^{\circ} \mathrm{C} \) to \( 60^{\circ} \mathrm{C} \) in the first \( 5 \mathrm{~min} \) and to \( 54^{\circ} \mathrm{C} \) in the next \( 5 \mathrm{~min} \). The temperature of the surroundings is
(a) \( 45^{\circ} \mathrm{C} \)
(b) \( 20^{\circ} \mathrm{C} \)
(c) \( 42^{\circ} \mathrm{C} \)
(d) \( 10^{\circ} \mathrm{C} \)
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