Math is a topic that often puzzles the mind of children as well as parents, and it usually occurs when parents try to help children. Now the same question on the internet has become viral, which is for 8-year-old students. An Internet user shared this question on the internet so that she could help her daughter's math homework.

The Question is:

There are 3 Lighthouses on the beach;

The light of the 1st lighthouse turned on for 3 seconds and turned off after 3 seconds.

The light of the 2nd lighthouse turned on for 4 seconds and turned off after 4 seconds.

The light of the 3rd lighthouse turned on for 5 seconds and turned off after 5 seconds.

But there is a moment when lights of all lighthouse turned off together. So tell the time when lights turned off together and also when the lights turned on together?

Can you answer this simple Question?