The average speed of the family car that travels a distance of 320 km in 4 hours is 80 km/h.
The average speed is given as:
[tex]s = \frac{d}{t}[/tex] (1)
Where:
d: is the total distance = 320 km
t: is the total time = 4 h
After entering the above values into equation (1), we have:
[tex]s = \frac{d}{t} = \frac{320 km}{4 h} = 80 km/h[/tex]
Therefore, the average speed of the journey is 80 km/h.
You can find more about average speed here https://brainly.com/question/13339323?referrer=searchResults
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