Brain Teaser #145

You are a cook in a remote area with no clocks or other way of keeping time other than a four minute sandglass timer and a seven minute sandglass timer. (The kind you turn over - hourglass shaped) You do have a stove, however, with water in a pot already boiling. Somebody asks you for a nine-minute egg, and you know this person is a perfectionist and will be able to tell if you undercook or overcook the eggs by even a few seconds. What is the least amount of time it will take to prepare the egg? And how will you prepare it so that it is neither undercooked or overcooked?
Solution
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Brain Teaser #84

1. A racing driver drove around a 6-mile track at 140 miles per hour for 3 miles, 168 miles per hour for 1.5 miles, and 210 miles per hour for 1.5 miles. What was his average speed for the entire 6 miles?

2. A girl is twice as old as her brother and half as old as her father. In 22 years, her brother will be half as old as his father. How old is the daughter now?
Solution
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The Big Book of Brain Games: 1,000 PlayThinks of Art, Mathematics & Science

Brain Teaser #62

It's All About Time

1. At what time after 4pm are the minute and hour and second hand of a standard clock perfectly aligned on top of each other?

2. How many times does a coin rotate in rolling completely about another coin, of the same size, without slipping?
Solution
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Brain Teaser #48

1. A man gave one son 10 cents and another son was given 15 cents. What time is it?

2. Round and round the ragged rock, The rugged rascal ran. Tell me how many r's are in that?

3. Three friends went out for drinks. The waiter brought them a check for $30, so each one of them paid $10. When the waiter took the cash, he realized he had made a mistake, and the check was for $25 instead. When he gave their change back, each friend got a dollar and they left the remaining two dollars as a tip. Therefore, each customer paid $9; multiplied by 3 this equals $27; plus $2 for the tip equals $29. Where is the remaining dollar?
Solution
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Got Some Time For Word Jumble....

Brain Teaser #37

1. A house with two occupants, sometimes one, rarely three.
Break the walls, eat the boarders, then throw away me.
What am I?

2. Fitzgerald drove 30 miles to work every day. He averaged the same speed going to work as he did coming from work. It took him one hour and thirty minutes to drive to work. Yet it only took him ninety minutes to drive home. How come?
Solution
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The Game Of Life - A Classic

Brain Teaser #18

If 2 hours ago it was as long after one o'clock in the afternoon as it was before one o'clock in the morning. What time would it be now?
Solution
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Brain Teaser #17

1. 3 1 4 1 5 9 2...
What are the next three numerals in this series?

2. A snail is at the bottom of a well 30 feet deep. It crawls up 3 feet each day, but at night, it slips down 2 feet. How long does it take for the snail to crawl out the well?
Solution
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ScienceWiz - Cool Circuits Puzzle Game