Question

The traffic lights at three different road crossings change after every 24 sec, 36 sec and 72 sec respectively. If they change simultaneously at 9 p.m, at what time they will change simultaneously again?​

Answer 1

Answer:

Step-by-step explanation:

The traffic lights at three different roads crossing change after every 48 seconds, 72 seconds, and 108 seconds. How often will they change simultaneously? It depends. If at some point they were changing simultaneously, they will continue to do so every 432 seconds.

Answer 2

Answer:

Take LCM answer will be 144 they will change after 144 seconds