Since Jose rides 4 miles per hour, for 3 hours, we have the following rule of three:
[tex]\begin{gathered} 4mi\rightarrow1h \\ x\rightarrow3h \\ \Rightarrow x=\frac{3\cdot4}{1}=12 \\ x=12mi \end{gathered}[/tex]thus, Jose rides 12 miles after 3 hours