To find out how far Joe drove, you can use the formula:
\[ \text{Distance} = \text{Speed} \times \text{Time} \]
Given that Joe drove at a speed of 80 kilometers per hour for 4 hours, the calculation is:
\[ \text{Distance} = 80 , \text{km/h} \times 4 , \text{h} = 320 , \text{km} \]
So, Joe drove a total of 320 kilometers.