<image>A reporter from a TV station's "Go to the Grassroots" program went to a rural area 360 km away for an interview. The first part of the journey was on the highway, and the latter part was on a rural road. If the car travels at a constant speed on both the highway and the rural road, the relationship between the distance traveled y (in km) and time x (in hours) is shown in the figure below. What is the car's speed on the rural road, in km/h? 