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t₂ − t₁

As we know that, the rate of cooling is

$\frac{dθ}{dt} = bA (θ - θ_{0})$

where, bA = constant

$\Rightarrow \frac{dθ}{dt} \propto θ - θ_{0} Also, - \frac{dT}{dt} \propto T - T_{0}$

where, T = temperature

and t = time

So, the rate of heat absorbed by cooled body is proportional to t₂ − t₁