perplexus.info :: General : Lighthouse Crossed Three Lights Muse

Lighthouse Crossed Three Lights Muse (Posted on 2023-11-17)

On the coast there are 3 lighthouses. All 3 turn on at time zero.
- The first light shines for 3 seconds, then is off for 3 seconds.
- The second light shines for 4 seconds, and then is off for 4 seconds.
- The third light shines for 5 seconds, then is off for 5 seconds.

When is the first time all the lights will be off at the same time?

See The Solution Submitted by K Sengupta

Rating: 4.0000 (1 votes)

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网课代上

| Comment 5 of 6 |

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Posted by neiljiohu on 2024-02-05 23:49:29

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