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Two lighthouse flash their lights every 20 seconds and 30 seconds respectively Given that they flash together at 8 pm when will they next flash together?
Wiki User
∙ 14y ago
8:01 PM.
After 60 seconds . . .
Light #1 flashes (60/20) = 3 more times: 8:00:20, 8:00:40, and 8:01.
Light #2 flashes (60/30) = 2 more times: 8:00:30 and 8:01.
They coincide at 8:01.
Wiki User
∙ 14y ago
Anonymous
solution ;
LCM of 20 and 30
20:2*2*5
30:2*3*5
LCM of 20 and 30 = 2*2*3*5
=60
60 seconds=1 minute
The two lighthouses will next flash together at 8:01
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