The image contains a graph showing the movement of a cyclist and a car. The cyclist starts from point A towards point B, which is 180 km away, at 7 AM. After some time, a car also starts from point A towards point B. The car reaches point B, stops for 3 hours, and then returns to point A at the same speed. Graph 1 represents the cyclist's movement, and Graph 2 represents the car's movement, but only for the journey from A to B. The horizontal axis represents time, and the vertical axis represents the distance from point A. What is the speed of the car when it returns from point B to point A?

To determine the speed of the car when returning from point B to point A, we need to analyze graph 2.

1. Identify the relevant part of the graph: The return journey of the car from point B to point A is represented by the segment of graph 2 where the distance from point A decreases.
2. Determine the distance and time for the return journey:
• From graph 2, we can see that the car reaches point B (180 km from A) at approximately 10 hours.
• After stopping for 3 hours (from 10 to 13 hours), the car starts its return journey from point B.
• The car reaches point A (0 km from A) at approximately 18 hours.
• Therefore, the distance covered during the return journey is 180 km (from B to A).
• The time taken for the return journey is 18 hours - 13 hours = 5 hours.
3. Calculate the speed: Speed = Distance / Time
4. Calculation: Speed = 180 km / 5 hours = 36 km/hour.

Ответ: 36 км/ч