the traffic lights at three different road crossing change after every 48sec, 72sec and 108 sec respectively. if they change 7a.m at what time will they change simultaneously again
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If they change simultaneously at 7 a.m. at what time will they change simultaneously again? L.C.M of 48, 72, 108 = 2 x 2 x 2 x 2 x 3 x 3 x 3 = 432 sec. After 432 seconds, the lights change simultaneously. = 7:07:12 a.m
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