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Question 5. Consider the network of two routes (a freeway and a city street connecting one O-D pair) shown below. Let O 2 1 Freeway City street t =3+0.5x t = 1 + x q=1.5 D (a) Find the UE solution and demonstrate that it is not an SO solution. (b) Find the SO solution and demonstrate that it is not an UE solution. (c) Find the toll (in equivalent unit as t) to be charged on the city street so that the total travel time in the network is minimized.