Question

the traffic lights at three different road crossings change after every 48 seconds , 72 seconds, 108 seconds if they change simultaniously at 7 am , at what time they will change simultaniously

Answer 1

Answer:

We know that in order to find the time when the three lights will change simultaneously again after 7 a.m., we need to find the LCM of 48, 72, and 108. Hence, after converting 432 seconds into minutes and seconds, we get: 432 seconds = 7 minutes and 12 second