Teacher A and B are scheduled to have a class at 2:00 pm until 3:30 pm in the afternoon. Both came to class on time however, according to the guard on duty, Teacher A finished the class at 3: 25 pm while Teacher B finished at 3:35 pm. However, both teachers claimed that they both finished the class on time. Explain how the special theory of relativity is involved in this situation.

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