Steam enters the condenser of a steam power plant at 50 kPa and a quality of 85 percent with a mass flow rate of 400 kg/min. It is to be cooled by water from a nearby river by circulating the water through the tubes within the condenser. To prevent thermal pollution, the river water is not allowed to experience a temperature rise above 20°C. If the steam is to leave the condenser as saturated liquid at 50 kPa, determine the mass flow rate of the cooling water required.

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