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Traffic lights at three different road crossing change after 48 seconds, 72 seconds, and 108 seconds respectively. At what time will they change together again if they change simultaneously at 7 A.M.?

Respuesta :

Answer: 8:07:12

Find the Prime Factors.

48 = 2⁴ x 3

72 = 2³ x 3²

108 = 2² x 3³

Find the Least Common Multiple.

Two:

LCM = 2⁴ x 3³

LCM = 16 x 27 = 432

Convert 432 seconds to minutes.

432 seconds = 7 minutes, 12 seconds.

Hope this helps!

santuy

Answer:

7 minutes , 12s

Step-by-step explanation:

Thanks bro

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