Respuesta :

✦ Explanation 

Find the unit rate by dividing the total amount of hours by the timing.

[tex] \frac{18}{4} [/tex] is the unit rate which can also be converted to [tex]4.5[/tex] or written as [tex]18:4[/tex].

Hope that helps! ★ If you have further questions about this question or need more help, feel free to comment below or leave me a PM. -UnicornFudge aka Nadia