You know that your friend's car starts at Linden at 1:30 pm and finally arrives at UG at 2:15 pm, but you don't know the route that your friend took. (It is not necessarily the shortest nor the most efficient route and it may have included stops, detours, or side trips.) The straight-line length ("as birds fly") between Linden and UG is 5.19 km, but the car's final odometer reading shows that the car travelled a total distance of 10.75 km from start to finish. What is was the average speed of the car in km/h?