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A 300-gal capacity tank contains a solution of 200 gal of water and 50 lb of...

A 300-gal capacity tank contains a solution of 200 gal of water and 50 lb of salt. A solution containing 3 lb of salt per gal is allowed to flow into the tank at the rate of 4 gal/min. The mixture flows from the tank at the rate of 2 gal/min. How many pounds of salt are in the tank at the end of 30 min? When does the tank start to overflow? How much salt is in the tank at the end of 60 min? Ans.: 357 lb, 50 min, 579 lb

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