I am having some problems figuring out how to design a student traffic flow system for students entering and leaving a hall. I have to solve the equation and discuss the solution. I can solve the one for a road junction and traffic patterns but I'm sort of puzzled when it comes to the hall. The hall has 7 doors. 3 to the front and 4 to the sides. I know how to put the numbers for going in and the traffic pattern. Does the number of students entering have to be equal to the amount coming out? Can anyone give me a little help and direction how to continue?