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Question: Two railroad tracks intersect at right angles at station O. At 10AM the train A, moving west with constant speed of 50 km/h, leaves the station O. One hour later train B, moving south with the constant speed of 60 km/h, passes through the station O.

Part A: Find minimum distance between these trains?

Any help I can get on this question is greatly appreciated! I'm not too familiar with this question.

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