Question

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.?

Answer 1

7 minutes , 12s

Explanation:

Thanks bro

Answer 2

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!