Difference between revisions of "Puzzles"
From Christoph's Personal Wiki
(New page: This article will list ''some'' of my favourite '''puzzles''' or '''brain teasers'''. *Problem: "How many degrees are there in the angle between the hour and minute hands of a clock when ...) |
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**Answer: 7.5° | **Answer: 7.5° | ||
**Explanation: Most common guess is 0°. At 3:15, the minute hand sits at the 3, but the hour hand is 1/4 of the way between 3 and 4. If the clock has 360° divided by 12 hours = 30°/hour. And 1/4 of 30° = 7.5°. | **Explanation: Most common guess is 0°. At 3:15, the minute hand sits at the 3, but the hour hand is 1/4 of the way between 3 and 4. If the clock has 360° divided by 12 hours = 30°/hour. And 1/4 of 30° = 7.5°. | ||
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| + | ==External links== | ||
| + | *[http://mindcipher.com/ Mindcipher] | ||
[[Category:Hobbies]] | [[Category:Hobbies]] | ||
Latest revision as of 15:40, 18 February 2009
This article will list some of my favourite puzzles or brain teasers.
- Problem: "How many degrees are there in the angle between the hour and minute hands of a clock when the time is a quarter past three?"
- Answer: 7.5°
- Explanation: Most common guess is 0°. At 3:15, the minute hand sits at the 3, but the hour hand is 1/4 of the way between 3 and 4. If the clock has 360° divided by 12 hours = 30°/hour. And 1/4 of 30° = 7.5°.
