A glass of hot water cools from 90^{\circ} {\C} to 70^{\circ} {\C} in 3 minutes when the temperature of surroundings is 20^{\circ} {\C}. What is the time taken by the glass of hot water to cool from 60^{\circ} {\C} to 40^{\circ} {\C} if the surrounding temperature remains the same at 20^{\circ} {\C} ?

COMEDK 2024 Shift 1 Paper

Question : 122 of 180

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A glass of hot water cools from 90∘C to 70∘C in 3 minutes when the temperature of surroundings is 20∘C. What is the time taken by the glass of hot water to cool from 60∘C to 40∘C if the surrounding temperature remains the same at 20∘C ?

15 minutes
6 minutes
12 minutes
10 minutes

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