the traffic lights at three different roads crossings change after every 42 sec ,72 seconds and 108 sec. if they change sim
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48 = 2 × 2 × 2 × 2 × 3
72 = 2 × 2 × 2 × 3 × 3
108 = 2 × 2 × 3 × 3 × 3
Hence LCM of 48, 72 and 108 is = 432
That is after 432 seconds they will change simultaneously.
432 seconds = 7 min 12 seconds
Thus the traffic lights change simultaneously at 7:7:12 am. Answer..........
72 = 2 × 2 × 2 × 3 × 3
108 = 2 × 2 × 3 × 3 × 3
Hence LCM of 48, 72 and 108 is = 432
That is after 432 seconds they will change simultaneously.
432 seconds = 7 min 12 seconds
Thus the traffic lights change simultaneously at 7:7:12 am. Answer..........
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