The traffic lights at three different …
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Rashmi Bajpayee 9 years, 3 months ago
They will change simultaneously again after L.C.M. (18, 72, 108) Seconds.
i.e. 18 = 2 x 3 x 3
72 = 2 x 2 x 2 x 3 x 3
108 = 2 x 2 x 3 x 3 x 3
L.C.M. (18, 72, 108) = 2 x 2 x 2 x 3 x 3 x 3 = 216 seconds = 3 min 36 seconds
Therefore, at 7:03:36 am, they will change again.
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