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Vansen left for school at $6:30$ am. He took half an hour to walk from his house to school. Ron reached school $1$ hour later than Vansen. At what time did Ron reach school? (adapted from 2009 Math Kangaroo Problem, Level 3-4, Question \#8) 
Overseas Competition->Knowledge Point->Combinatorics->Time Problem->Time Calculation
Half an hour after $6:30$ is $7:00$  $7+1=8$ 