Answers

2016-05-15T16:40:40+05:30
48 = 2 × 2 × 2 × 2 × 3
72 = 2 × 2 × 2 × 3 × 3
108 = 2 × 2 × 3 × 3 × 3
Hence LCM of 48, 72 and 108 is = 432
That is after 432 seconds they will change simultaneously.
432 seconds = 7 min 12 seconds
Thus the traffic lights change simultaneously at 7:7:12 am. Answer..........
0
Pleez mark It As Brainliest.......