Solution: Since the relationship is directly proportional, we can set up a proportion based on the given information.
Let x be the total kilometers walked after 17 trips.
Given: 4 trips = 20 kilometers
Therefore, 1 trip = 20 / 4 = 5 kilometers
So, 17 trips = 17 * 5 = 85 kilometers
Answer: Alice will have walked a total of 85 kilometers after 17 trips.
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