Respuesta :

znk

Answer:

[tex]\large \boxed{\text{36 mi}}[/tex]

Step-by-step explanation:

[tex]\text{Distance} = \text{speed} \times \text{time} = \dfrac{\text{9 mi}}{\text{3 h}} \times \text{12 h}\\\\\text{Roy could hike $\large \boxed{\textbf{36 mi}}$}[/tex]