Question

6. The traffic lights at three different road crossings change after every 48 seconds, 72
seconds and 108 seconds respectively. If they change simultaneously at
7 a.m., at what time will they change simultaneously again?​

Answer 1

Answer:

7:07:12 Take LCM of 48,72 and 108 seconds and add it to 7:00 am to get desired result

Answer 2

Answer:

7:7:12 am

Step-by-step explanation:

find the lcm of 48,72 and 108

lcm= 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