Could use some help thanks

A tank contains 4000 liters (L) of a solution consisting of 266 kg of salt dissolved in water. Pure water is pumped into the tank at the rate of 4 L/s, and the mixture-kept uniform by stirring-is pumped out at the same rate. How long will it be until only 14 kg of salt remains in the tank? . . . It will take about seconds. (Round to the nearest second as needed.)