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RRB NTPC Mains or Stage 2 Model Paper 6 with solutions

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Question : 28

Total: 119

The traffic lights at three different road crossings change after every 48 seconds, 72 seconds and 108 seconds respectively. If they all change simultaneously at 8 : 20 hours, then at what time will they again change simultaneously ?

8 : 20 : 08 hrs
8 : 24 : 10 hrs
8 : 27 : 12 hrs
8 : 30 : 15 hrs

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