Two routes connect a city and a sub-urban. During the Peak-hour morning commute, a total travel from the sub-urban to the city. Route 1 has a 96km/h speed limit and is 9.6km in length. Route 2 i 4.8km in length with a 72km/h speed limit. Studies show that the total travel time on route 1 increases 2 minutes for every additional 500 vehicles added. Minutes of travel time on route 2 increases with the square of the number of vehides expressed in Thousands of vehicles per hour. Determine the user equilibrium travel time.