Answer:
They will flash together at;
8:01 PM
Step-by-step explanation:
Here, we want to
calculate the time at which they would both flash together
What we have to do here is to calculate the lowest common multiple of 20
and 30 seconds
Mathematically, we have this as;
60 seconds
60 seconds is the same as 1 minute
So the time they will flash together is 8:01 PM
