[21 hours] A, B, C, D start at the same time to run around a circular garden in the same direction. A completes

For Competitive Exams

A, B, C, D start at the same time to run around a circular garden in the same direction. A completes a round in 30 minutes, B in 60 minutes, C in 90 minutes and D in 105 minutes. After what time will they meet again at the starting point?

15 hours

10 hours

21 hours

20 hours

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