A body takes 4 min . to cool from $61^{\circ} \mathrm{C}$ to $59^{\circ} \mathrm{C}$. If the temperature of the surroundings is $30^{\circ} \mathrm{C}$, the time taken by the body to cool from $51^{\circ} \mathrm{C}$ to $49^{\circ} \mathrm{C}$ is :
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