We can solve it using the rule of three, so by writing down the rule of three we get
[tex]\frac{6\text{ miles}}{30\text{ minutes}}=\frac{15\text{ miles}}{x\text{ minutes}}[/tex]Do the cross multiplication
[tex]\begin{gathered} 30\cdot15=6\cdot x \\ \\ \end{gathered}[/tex]Solve it for x
[tex]\begin{gathered} 450=6\cdot x \\ \\ x=\frac{450}{6} \\ \\ x=75\text{ minutes} \end{gathered}[/tex]Then it would take 75 minutes to ride 15 miles
