Question: In a heating system, cold outdoor air at 7C flowing at a rate of 4 kg/min is mixed adiabatically with heated air at 70C flowing

In a heating system, cold outdoor air at 7°C flowing at a rate of 4 kg/min is mixed adiabatically with heated air at 70°C flowing at a rate of 3 kg/min. The exit temperature of the mixture is
(a) 34°C
(b) 39°C
(c) 45°C
(d) 63°C
(e) 77°C

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