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7. An open tank has volume of 2000 L, and an initial concentration of nitrate of 150 mg/L as N. You can't empty the tank, all you can do is start adding water with no nitrate (Cin = 0), mix the water very well as you are doing it, and let the nitrate slowly be washed out by continuous dilution.If the flow in is 10 L/min from your hose (with 10 L/min then flowing over the brim), how long is it going to take you to get the concentration down to 75 mg/L? (Is this a half-life?)

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