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?
Answer: 5 seconds
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.
I feel this situation can yield more interesting questions.
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Posted by Jer
on 2023-11-17 08:57:28 |
Solution
