T1 - T2 = 140
T2 = T1 - 140.. (i)
Now as we know
n = 1 - T2 / T1
0.312 = 1 + 140 / T1 - 1
T1 = 448.72 K ==>> ( hot reservoir)
putting in (i)
T2 = 308.72 K ===>> (cold reservoir)
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