Final answer:
The average speed for a car's round trip from point X to point Y and back is the total distance traveled divided by the total time taken. If a car travels 150 km to point Y in 3.2 hours and returns the same way, the average speed would be 46.875 km/h.
Step-by-step explanation:
When a car moves from point X to point Y at a uniform speed and then returns from Y to X at a uniform speed, the average speed for the entire round trip can be calculated by using the total distance traveled divided by the total time taken for the trip. To calculate the average speed, we use the following formula:
Vavg = Total distance / Total time
If, for example, a car travels 150 kilometers from X to Y in 3.2 hours, then returns the same distance in 3.2 hours, the total distance traveled would be 300 kilometers, and the total time would be 6.4 hours. The average speed would thus be:
Vavg = 300 km / 6.4 h = 46.875 km/h
Note that this is different from the average velocity, which for a round trip would be zero since displacement is zero.