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Different networks connect in Quebec and New Brunswick and allow the connection to be made to other Canadian provinces and the neighbouring US. The graph below represents a part of the railway network. We can see the number of merchandise wagons that enter and exit the network daily and the main cities where the lanes connect. We can also observe the direction in which the trains circulate as well as the variables X representing the number of merchandise wagons circulating daily. We can also see that a certain quantity of merchandise exits the network via the port of the city of Quebec to be exported overseas. (b) In order to save on operating costs, the MMA is considering feline da tore railway linking Sherbrooke to Quebec. What would be the effects of this closure on rail traffic? (c) Company statistics indicate that an average of 20 freight cars circulate daily between Saint-Jean-sur-Richelieu and Sherbrooke and that 10 cars per day use the line linking Sherbrooke to Saint John. We request you to use these statistics in order to determine on which channel(s) of the network railway the number of wagons circulating daily would increase following the closure of the Sherbrooke-Qubec lane