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A tank initially holds 140 L of salt water with density of 1.05g/cm3. Over a 30-minute...

A tank initially holds 140 L of salt water with density of 1.05g/cm3. Over a 30-minute period, both hot and cold water enter (Q[hot]: Q[cold]= 3:1) the tank while mixed warm water is drained from one outlet. The discharge rate at the outlet is 25L/min and the volume of the water left in the tank at the end of 30 minutes is 40 L. What is the mass flow rate of cold water entering.

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