The blue and red light will flash together after every 24 seconds.
What is LCM ?
LCM is the Least Common Multiple of at least two numbers, It is the smallest number that will be completely divisible by both the numbers.
The blue light flashes every 8 seconds
The red light flashes every 12 seconds
The time at which they will flash together can be determined by finding their LCM
LCM of 8 and 12 is 24.
Therefore, after every 24 seconds, they will flash together.
To know more about LCM
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