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Explanation
A person Moiz was trying to sleep but because of too much noise he couldn’t sleep well. There are three things who disturbing him.
- Clock
- Tab
- Dog
- Clock is ticking after every 5 sec
- Tap was dipping after every 7 sec
- Pet dog snored every 12 sec
He observed, all things happened at 12 a.m.
To Find
After how many seconds all three things happened together again = ?
Solution
The following things are being repeated after a certain time, as described below;
- Ticking of clock = 5 seconds
- Dipping of tap = 7 seconds
- Snoring of dog = 12 seconds
So,

Now,
2 x 2 x 3 x 5 x 7 = 420 seconds
Conclusion
So all three things would be happened once again after 420 seconds.