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Is a blue light is on every 2 seconds and a green light is on every 3 second and a red light is on every 4 seconds how often in a 4 hour period will all the lights be on at the same time?
Wiki User
∙ 14y ago
all three lights will be on every twelve seconds, or five times per minute. 5 (times per minute x 240 (minutes in 4 hours) = 1200.
this is assuming that the duration of the light being on is an immeasurable instant.
Wiki User
∙ 14y ago
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