Question: An adiabatic heat exchanger is used to heat cold water at 15C entering at a rate of 5 kg/s by hot air at 90C entering

An adiabatic heat exchanger is used to heat cold water at 15°C entering at a rate of 5 kg/s by hot air at 90°C entering also at a rate of 5 kg/s. If the exit temperature of hot air is 20°C, the exit temperature of cold water is
(a) 27°C (d) 85°C
(b) 32°C (e) 90°C
(c) 52°C

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