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A body cools down from $75^{\circ} \mathrm{C}$ to $60^{\circ} \mathrm{C}$ in 10 minutes. It will cool down from $65^{\circ} \mathrm{C}$ to $55^{\circ} \mathrm{C}$ in a time
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More than 10 minutes
From Newton's law of cooling, rate of cooling of substance is directly proportional to temperature difference with the surrounding. So as the temperature reduces, the rate of cooling decreases and time of cooling increases.
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