Math
posted by Anonymous .
the green light flashes every 3 seconds,the red every 5 seconds and white at 10 seconds. iF they flash at 12 noon.When will they flash together again in a minute? in an hour?

Math 
MathMate
Both, in a minute and in an hour.
The LCM of 3, 5 and 10 is the same as the LCM of 3 and 10 because 5 divides 10 (5 is a factor of 10).
The LCM of 3 and 10 is 30.
So the soonest the will flash together is 30 seconds. 
Awesome 
Awesome
The LCM of 3, 5 and 10 is the same as the LCM of 3 and 10 because 5 divides 10 (5 is a factor of 10).
The LCM of 3 and 10 is 30.
So the soonest the will flash together is 30 seconds.
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