In this problem, you are trying to find the unit rate. The unit rate is, how many feet does the dolphin swim in 1 hour? This is a unit rate because the amount of hours is 1 hour, and unit rates always have a denominator of 1.
So, to find the unit rate, we must simplify
<h3> </h3>
How do we simplify it? The denominator of this problem is already 3. How do we get from 3 to 1? We divide 3 by itself (3 ÷ 3). That equals 1.
<h3> </h3><h3>= </h3>
[we divided both by 3]
<em>Rule: Whatever you do to the numerator, you must do to the denominator.</em>