A tank contains 70 kg of salt and 2000 L of water Pure water enters a tank at the rate 12 L min The solution is mixed and drains from the tank at the rate 6 L min a What is the amount of salt in the tank initially kg amount b Find the amount of salt in the tank after 2 5 hours kg amount c Find the concentration of salt in the solution in the tank as time approaches infinity Assume your tank is large enough to hold all the solution