1 A tank with a capacity of 400 gal initially contains 100 gal of water with 50 lb of salt dissolved in it. Water containing one (1) lb of salt per gallon enters at a rate of three (3) gal/min from the top, and the well- mixed tank content is allowed to flow out at a rate of two (2) gal/min from the bottom. Find the liquid volume in the tank over time and the time period over which you will be able to develop valid design equations that describe how the volume and the salt contents in the tank change with time ? What will be the ¹and what will be the liquid volume and salt design equation for the salt content over that time period content one hour before your equations become invalid

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