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Distance covered by the first train in 1 hour (6:00 AM to 7:00 AM) = 60 km. Remaining distance = 620 - 60 = 560 km. Relative speed = 60 + 80 = 140 km/hr. Time to meet = 560 / 140 = 4 hours Meeting time = 7:00 AM + 4 hours = 11:00 AM. Answer: b) 11:00 AM
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