Salt Concentration in 4000L Tank: Find the Limit

[step1536]

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

 

[lanedance]

any ideas - you should show your attempt