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MHT CET Physics question

PhysicsThermal Properties of MatterMHT CET

A body cools from 100℃ to 70℃ in 8 minutes. If temperature of surrounding is 15℃, then time required for body cools from 70℃ to 40℃ is

Answer: (A)

Solution

gives ; then gives $t =

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Question ID VK-063588