Question

1. At two crossroads signals, lights change after every 25 seconds and 45
seconds respectively. If they changed together at 9:20 a.m., then when will
they change together next?
(A) at 9:23:45 a.m. (B) at 9:23:15 a.m.
(C) at 9:23.30 am. (D) at 9:23:00 a.m.
plz give me step by step explanation ​

Answer 1

Answer:

3 mins 45 seconds . They first changed at 9:20 am . So, they will change together next at 9:23:45 am . Thus , option A is the correct option .