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?

Submitted by K Sengupta

Rating: 4.0000 (1 votes)

Solution: (Hide)

Answer: 5 seconds.
Explanation:
The first light is off from 3 to 6 seconds. The second is off from 4 to 8 seconds. The third is off from 5 to 10 seconds. So from 5 to 6 seconds they are all off.

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
No Subject	K Sengupta	2024-02-06 11:45:03
网课代上	neiljiohu	2024-02-05 23:49:29
No Subject	K Sengupta	2024-01-12 06:16:51
No Subject	meeloun education	2024-01-12 00:42:11
re: Solution	Brian Smith	2023-11-17 09:48:04
Solution	Jer	2023-11-17 08:57:28

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