Question

On MG Road three traffic lights change after 36, 42 and 72 seconds if the life first switched on at 9:00 a.m. at what time they will change.

plzz write full step by step answer​

Answer 1

Answer:

Time = 9:08 :24

Step-by-step explanation:

Lcm of 36,42,72=504

so after 504 seconds they will change simultaneously.

504 seconds =504/60=8mins 24 sec

So add 8 mins 24 sec to 9 am....

ans will be 9:08 :24