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Puk3s

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A tank contains 100 kg of salt and 2000 L of water. A solution of a concentration 0.025 kg of salt per liter enters a tank at the rate 5 L/min. The solution is mixed and drains from the tank at the same rate.

A.What is the concentration of our solution in the tank initially

B.Find the amount of salt in the tank after 4.5 hours

C.Find the concentration of salt in the solution in the tank as time approaches infinity.

I found A to be .05 and C to be .025. But I'm not sure how to get B... I know I have to set up an equation but I'm not very good at these word problems and could use some help setting up the equation and answering B so any help would be great!

Thanks!