The traffic lights at three different ro...

The traffic lights at three different road crossings change after every 24, 48 and 72 seconds. If they all change simultaneously at 9:10:12 hours, then at what time will they again change simultaneously?

9 : 12 : 15 hr

9 : 10 : 48 hr

9 : 12 : 36 hr

9 : 10 : 50 hr

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