1. Att = 0, the tank contains 600 liters of water with 5 lbs of salt dissolved in it. Water goes into the tank at a rate of 9 liters per hour and has a salt concentration of 1/5(1+cos t) lbs per liter. If a well mixed solution leaves the tank at a rate of 6 liters per hour, how much salt is in the tank when it overflows if capacity of the tank is 1500 liters?

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