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Prof. Mathur and Prof. Singh attended the All India Historian’s meet last week. Prof. Mathur told Prof. Singh, “I found out that your teaching experience is twice that of mine”. Prof. Singh replied in the affirmative. Prof. Mathur continued, “But last time when both of us came for the same meet, I remember that your teaching experiencr was thrice that of mine”. “That was 2 years ago.” Prof. Singh said. How many years has Prof. Singh been working?