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The traffic lights at three different road junctions change after every 40 seconds, 60 seconds and 72 seconds respectively. If they changed simultaneously together at 8 a.m at the junctions, at what time will they simultaneously change together again?

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This is an LCM related problem

Finding the LCM of 40, 60 and 72

60 seconds = 1 min

360 min = 6 min

LCM (40, 60, 72) = 2 × 2 × 3 × 5 × 2 × 3 = 360

After 360 seconds they will change again i.e after six minutes they will change again i.e at 8.06 am they will change again simultaneously.

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