Let's denote the lengths of the trails as follows:
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Let \( B \) be the length of the beginner trail.
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The medium trail \( M \) is 1.2 times the length of the beginner trail:
\( M = 1.2B \). -
The advanced trail \( A \) is 3.6 times the length of the medium trail:
\( A = 3.6M = 3.6(1.2B) \).
Now, we can calculate \( A \):
\[ A = 3.6 \times 1.2B = 4.32B. \]
Thus, the advanced trail is 4.32 times as long as the beginner trail.