A mixing tank holds 300 gallons of brine. Another brine solution with salt concentration of 2 pounds salt per gallon is pumped into the tank at a rate of 3 gallons per minute (gpm). The mixture in the tank is well stirred and is pumped out at the same rate as the entering solution. If 50 pounds salt was dissolved in the initial 300 gallons, how much salt would be in the tank after i). 3 hours ii) a long time?