Question

What is the unit rate of 183 miles in three hours

Answer 1

I reccomend the search bar up at the top ("What is your question") before you ask questions, to make sure they're not already answered.

Unit rate is a quantity per one unit of time. In this case, how many miles per one hour. Simply divide both numerator and denominator by 3.
$\frac{183 miles}{3 hr} \frac{/3}{/3} = 61 mi/h$

Answer 2

61 miles per hour, because if you divide 183/3 you will get 61.