A large pond initially contains 200 liters of fresh water (no chemical). A fluid containing 10 grams of chemical per liter flows into the pond with the rate 15 liters per hour. Find the concentration of chemical in grams per liter in the pond, that is, find lim limiting m(t) c(t) where 1 c(t) V(t) ' V(t) is the total volume of the pond m(t) is the total mass of chemical in the pond at time t, and at time t.

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