Question

the traffic lights at three different road crossings change every 48 seconds , 72 seconds and 108 seconds respectively. if they change simultaneously at 7am , at what time will they change simultaneously again

Answer 1

Answer:

7:07 am

Step-by-step explanation:

LCM of 48, 72 and 108 = 432

432 seconds = 7 minutes 12 seconds

so, the traffic lights will change simultaneously again at 7:07 am