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In a room where the temperature is 30^oC a body cools from 61^oC to 59^oC in 4 minute. The time taken by the body to cool from 51^oC to 49^oC will be:

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Correct option is B

From θ1-θ2t=Kθ1+θ22-θ0We have 59-614=K59+612-30⇒K=16051-49t=K51+492-30⇒2t=160(20)⇒t=6 minute.

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In a room where the temperature is 30oC a body cools from 61oC to 59oC in 4 minute. The time taken by the body to cool from 51oC to 49oC will be:

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In a room where the temperature is 30^oC a body cools from 61^oC to 59^oC in 4 minute. The time taken by the body to cool from 51^oC to 49^oC will be: