The difference in their length is 25/4 ft
Data;
To solve this problem, the first step we need to take is convert the mixed fraction into improper fraction.
Zoo Alligator
[tex]12\frac{11}{12}=\frac{155}{12}[/tex]
Record Length
[tex]19\frac{1}{6}=\frac{115}{6}[/tex]
To find the difference in length, we subtract the values
[tex]\frac{115}{6} - \frac{155}{12} = 25/4 ft[/tex]
The Record Alligator is 25/4 ft longer than the Zoo Alligator.
Learn more on subtraction of fractions here;
https://brainly.com/question/13197173