2 A tank with a capacity of 500 liters originally contains 200 liters of water with 100 kilograms of salt in the solution Water containing 1 kg of salt per liter is entering at a rate of 3 liter min and the mixture is allowed to flow out of the tank at a rate of 2liter min Find the amount of salt in the tank at any time prior to the instant when the solution begins to overflow Find the concentration in kilograms per liter of salt in the tank at the instant it starts to overflow