Final answer:
To calculate the average speed of a spaceship to the moon, divide the total distance of 386,400 km by the total time taken, which is 72 hours, to get an average speed of 5,366.7 km/h.
Step-by-step explanation:
To find the average speed of a spaceship to the moon, we use the formula:
average speed = total distance / total time
The spaceship covered 386,400 km in 72 hours. So, we calculate the average speed as follows:
Average Speed = 386,400 km / 72 hours = 5,366.7 km/h
This speed is much slower compared to the record speeds of some spacecraft referenced, like the Parker Solar Probe which reached 68.6 km/s, but it is still a significant figure for space travel.