The traffic lights at three different …
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Sia ? 6 years, 4 months ago
{tex}\therefore{/tex} L.C.M. of 48, 72 and 108 = 2 × 2 × 2 × 2 × 3 × 3 × 3 = 432.
432 seconds = 7 min 12 seconds.
Hence, they will change simultaneously again 7 min 12 seconds after 7 a.m.
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