SOLUTION: If a red light flashes every 12 seconds and a yellow light flashes every 30 seconds, what second will the flash at the same time
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Question 908783: If a red light flashes every 12 seconds and a yellow light flashes every 30 seconds, what second will the flash at the same time
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
They will flash together at the same time every 60 seconds, ie every minute.
Why 60? Because 60 is the LCM of 12 and 30
Multiples of 12: 12,24,36,48,60,72,84,96,108,120
Multiples of 30: 30,60,90,120,240,270,300
Notice 60 is the smallest multiple they have in common.
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