A 2-lb-per-gallon salt solution is pumped in a 400-gallon tank at a rate of 2 gallons per minute. At the same time, the well- stirred solution is pumped out at a rate of 1 gallon per minute. If the tank originally contains 150 gallons of pure water, how much salt is in the tank as soon as it starts to overflow? O 443.3 lbs O 824.8 lbs O 687.5 lbs O 311.6 lbs

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