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The traffic lights at three different...

The traffic lights at three different signal points change after every 45 seconds, 75 seconds and 90 seconds respectively. If all change simultaneously at 7 : 20 : 15 hours, then they will change again simultaneously at (a) 7 : 28 : 00 hours          (b) 7 : 27 : 45 hours (c) 7 : 27 : 30 hours          (d) 7 : 27 : 50 hours

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