A and B walk around a circular track. A and B walk at a speed of 2 rounds per hour and 3 rounds per hour respectively. If they start at 10.30 a.m. from the same point in opposite directions, how many times shall they cross each other at noon?

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A and B walk around a circular track. A and B walk at a speed of 2 rounds per hour and 3 rounds per hour respectively. If they start at 10.30 a.m. from the same point in opposite directions, how many times shall they cross each other at noon?