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Class A: 10, 15, 12, 18, 20
Mean time for Class A: (10 + 15 + 12 + 18 + 20) / 5 = 15 minutes
Class B: 8, 14, 16, 19, 22
Mean time for Class B: (8 + 14 + 16 + 19 + 22) / 5 = 15.8 minutes
Difference in mean times: 15.8 - 15 = 0.8 minutes
Therefore, the mean time Class A spent completing the quiz is 15 minutes, the mean time Class B spent completing the quiz is 15.8 minutes, and the mean times Class A and Class B spent completing the quiz differ by 0.8 minutes.