the exhaust gases from an oil engine are passed through a water heater. the gasses have a specific heat of 1.0467KJ/kg-K and the temperature falls from 420 degree Celsius to 150 degree Celsius is flowing through the heater. the flow being 25 Kg/min. if the water enters the heater at 40 degree Celsius and flows at the rate of 40Kg/min, find its temperature at the exit.
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