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Q.

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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a

4 minute

b

6 minute

c

5 minute

d

8 minute

answer is B.

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Detailed Solution

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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