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Question

19 Traffic lights at three different points are changing respectively at 24,48and 72 seconds. If all three are changed together at 9:10:24 hours, then when will the next change take place together? Options: (a) 9:12:25 hours (b) 9:10:48 hours (c) 9:12:48 hours (d) 9:10:50 hours

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