The traffic lights of three different road crossings change after every 72, 96, 120 seconds respectively. If they change simultaneously at 6:00 am, at what time will they change simultaneously again ?
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Step-by-step explanation:
Explanation: We know that in order to find the time when the three lights will change simultaneously again after 7 a.m., we need to find the LCM of 48, 72, and 108. Hence, converting 432 seconds into minutes and seconds, we get: 432 seconds = 7 minutes and 12 seconds.