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Homework Help: Word Problem

  1. Sep 24, 2009 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
    A tank contains 4000L of pure water. Brine that contains 30g of salt per liter of water is pumped into the tank at a rate of 25L/min. Show that the concentration of salt after t minutes (in grams per liter) is C(t) = 30t/160+t

    What happens to the concentration as t --> infinity
    lim C(t)= ____________g/L
    t --> infinity
  2. jcsd
  3. Sep 25, 2009 #2


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    Homework Helper

    any ideas - you should show your attempt
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