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The traffic lights at three different road crossings change after every 48 seconds, 72 seconds and 108 seconds respectively. If they all change simult

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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 a.m . Then at what time will they again change simultanously ?
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Correct Answer - `8:7:21` hrs
Interval of change= LCM ( 48 seconds, 72 seconds, 108 seconds) = 432 seconds = 7 min 12 seconds.
Required time of simultaneous change = 8:7:12 hours.
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