To find the number of adults in line at the superhero movie, we start by using the given ratio of kids to adults, which is 3:2.
Let's define:
- The number of kids as \( 3x \)
- The number of adults as \( 2x \)
The total number of people (kids + adults) is given by:
\[ 3x + 2x = 155 \]
Combining the terms gives:
\[ 5x = 155 \]
Now, we can solve for \( x \):
\[ x = \frac{155}{5} = 31 \]
Now that we have \( x \), we can find the number of adults:
\[ \text{Number of adults} = 2x = 2 \times 31 = 62 \]
Therefore, the number of adults in line is \( \boxed{62} \).