Question

The traffic light of three different road crossing change after every 48second 72second and 108second. If they start changing simultaneously at 8a.m .after how much time will they change agiam simultaneously

Answer 1

48 seconds my answer is right

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

therefore 8:00am+7.2 min

The required time is 8:07:02 am