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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.

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โˆ™ 2010-01-17 05:58:25
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Anonymous

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โˆ™ 2020-09-06 09:19:03

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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Q: 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?
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