Lena can't wait to read the newest issue of her favorite comic, The Notorious Ninja, so she plans to bike 3 miles to the comic book store after school. If Lena can usually bike 12 miles in an hour, how many minutes will it take her to get there?

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To find out how long it will take Lena to bike 3 miles to the comic book store, we first need to determine her biking speed in miles per minute.

Lena can bike 12 miles in 1 hour. Since there are 60 minutes in an hour, we can calculate her speed in miles per minute as follows:

\[ \text{Speed} = \frac{12 \text{ miles}}{60 \text{ minutes}} = 0.2 \text{ miles per minute} \]

Next, we need to find out how long it takes her to bike 3 miles. We can do this using the formula:

\[ \text{Time} = \frac{\text{Distance}}{\text{Speed}} \]

Substituting in the values:

\[ \text{Time} = \frac{3 \text{ miles}}{0.2 \text{ miles per minute}} = 15 \text{ minutes} \]

Thus, it will take Lena 15 minutes to bike to the comic book store.