A tank initially contains 50 gal. of fresh water. Brine (water in which a certain number of pounds of salt have been dissolved), containing 2 lb/gal of salt, flows into the tank at the rate of 2 gal/min and the mixture kept uniform by stirring runs out at the same rate. How long will it take to increase from 40 lbs. to 80 lbs.?

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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A tank initially contains 50 gal. of fresh water. Brine (water in which a certain number of pounds of salt have been dissolved), containing 2 lb/gal of salt, flows into the tank at the rate of 2 gal/min and the mixture kept uniform by stirring runs out at the same rate. How long will it take to increase from 40 lbs. to 80 lbs.?

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