A, B, C start at the same time in same direction to run around a circular lake. A completes the whole round in 12 seconds, B in 23 seconds and C in 45 seconds, all starting at the same point. After what time will they meet again at starting point?

Options
- 59 minutes
- 60 minutes
- 69 minutes
- 70 minutes

CORRECT ANSWER : 69 minutes

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