It takes $10$ minutes to cool a liquid from $61^oC$ to $59^oC$. If room temperature is $30^oC$ then time taken in cooling from $51^oC$ to $49^oC$ is ....... $\min$
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(d) In first case $\frac{{61 - 59}}{{10}} = K\left[ {\frac{{61 + 59}}{2} - 30} \right]$….$(i)$ n
second case $\frac{{51 - 49}}{{10}} = K\left[ {\frac{{51 + 49}}{2} - 30} \right]$….$(ii)$
By solving $t = 15$ $min.$
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