# Math

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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 -

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 -

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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