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A tank contains 2000 L of a solution consisting of 50 kg of salt dissolved in water. Pure water is pumped into the tank at

A tank contains 2000 L of a solution consisting of 50 kg of salt dissolved in water. Pure

water is pumped into the tank at the rate of 10L/s, and the mixture (kept uniform by

stirring) is pumped out at the same rate. How long will it be until only 5 kg of salt

remain in the tank?

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