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Math Chapter Wise question with answer

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Question #52,809
Math Chapter Wise Arithmetic English MCQ TGT 2009

Q.'A' rotates around a circular area at the rate of 1 rev./hour while 'B' rotates around the same area at the rate of 6 revolution/hour. If they both start moving together in the same direction at 7: 30 AM, When will they cross each other for the first time.

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