Meet-Up Problems: Problem 3

Problem: At 8:00 in the morning, Luke and Ivan start walking towards each other at a constant rate. At 9:20, they are at a distance of 10 kilometers from each other. 10:00, and they are at a distance of 10 kilometers from each other. At 11:00, Luke reaches Ivan's starting place. At 11:00, Ivan is ___________kilometers from Luke's starting place.

Key: Where did the second 10 kilometers come from?

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