Question

The traffic light at three different road crossing change after every 48sec, 72 sec and 108 sec if they start changing simultaneously at 8am after how much time will they change again simultaneously?

Answer 1

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 (2 × 2 × 2 × 2 × 3 × 3 × 3)
 = 432 seconds =7 min 12 sec
req.time 8:7:12

Answer 2

Answer:

Step-by-step explanation: