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A tank contains 1000 liters (L) of a solution consisting of 100 kg of salt dissolved in water. Pure water is pumped into the

A tank contains 1000 liters (L) of a solution consisting of 100 kg of salt dissolved in water. Pure water is pumped into the tank at the rate of 5 L/s, and the mixture-kept uniform by stirring- is pumped out at the same rate. How long will it be until only 10 kg of salt remains in the tank?

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