A body cools from ${50}^0\mathrm{C} \mathrm{to} {49}^{\mathrm{o}}\mathrm{C} \mathrm{in} 5 \sec . \mathrm{How} \mathrm{long} \mathrm{will} \mathrm{it} \mathrm{take} \mathrm{to} \mathrm{cool} {40}^0\mathrm{C} \mathrm{to} 39.0^0\mathrm{C}?$ Assume the temperature of surroundings to be ${30}^0\mathrm{C}$ $\mathrm{and} \mathrm{Newton}\text{'}\mathrm{s} \mathrm{law} \mathrm{of} \mathrm{cooling} \mathrm{to} \mathrm{be} \mathrm{valid}:$

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