Question

the traffic lights at three different road Crossings the traffic lights at three different road Crossings change after every 48 second 72 seconds and were not 8 seconds respectively if they change simulator you sleep at 7:00 a.m. at what time will they change simultaneously. again ​

Answer 1

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We should find out LCM of 48 ,72 and 108

prime factorization of

48÷2×2×2×2×3

72=2×2×2××3×3

108=2×2×3×3×3

LCM=2×2×2×2×3×3×3=432

432/60=7.2 min

therefore 7:00am+7.2 min

The required time is 7:07:02 am