Question

the three traffic lights are at different roads crossings change after every 48seconds 72 seconds and 108 seconds respectively if they change simultaneously on what time the change together​

Answer 1

Step-by-step explanation:

at 432 second

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Answer 2

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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

After 7.02 min or 432 seconds