Highest Product Using All Digits

What is the highest product that can be generated by multiplying two numbers while only using each digit once (1 through 9)?
For example, 12345678 * 9 = 111,111,102

9642 * 87531 = 843,973,902

Posted in Brain Teasers

A Mile Long Train

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

Two minutes. The back of the train would be at the beginning of the tunnel after 1 minute, and would leave the end of the tunnel at the 2 minute mark.

Posted in Brain Teasers

Which Door First?

While driving his car a man slams on the brakes when he sees, in the middle of the street, a diamond studded door, a gold door and a silver door. Which door does he open first?

His car door

Posted in Brain Teasers

Five Letters But One Left When Two Removed

What word of five letters has only one left when two letters are removed?

Any 5-letter word with the word ‘one’ somewhere in it. Examples include shone, stone, alone, money, loner, phone or ornery. Note it doesn’t say there is only one letter left, but only ‘one’ left. Tricky tricky.

Posted in Riddles

What Binds These?

What word binds all of these together?

Burglar
Fat
Copy
Bag
Nap

Cat.

Cat burglar
Fat cat
Copy cat
Let the cat out of the bag
Cat nap

Posted in Riddles

Reaching As High As Your Neck

Reaching as high as your neck, waist, or knees,
The going gets slower when wading through these.

What are they?

Shallows

By Sef Daystrom

Posted in Riddles

Money For Answers

A dad offered to pay his son $5 for every correct answer on his math test. His son said he would pay his Dad $8 for every incorrect answer. There were 26 questions on the test and no money was exchanged.

How did this happen?

The son got 16 questions correct and missed 10. This means he owed his Dad 10 * $8 = $80, but his Dad owed him 16 * $5 = $80, so it was a wash.
Two math equations to solve it are x + y = 26 and 5x = 8y.

Posted in Brain Teasers

Harvest Though No Grain

I harvest you, though you’ve no grain,
I reap you in the wind and rain,
You bleed not but your soft meat
And nectar makes a sweetest treat.
What am I?

A clam or oyster. You harvest clams or oysters on the beach or go diving, and the beach is often windy and rainy. Neither bleeds but are known for having, soft, slimy meat, and people often drink the “clam nectar” or “oyster juice”.

Thanks to Helena for this submission

Posted in Riddles
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What Can Fill a Bedroom But Fits in Your Pocket

A father gathered his three sons and told them he would die soon and needed to decide which son would inherit his land. He gave them the following test.

“Go to the market and purchase something that is large enough to fill my bedroom, but small enough to fit in your pocket. Based on what you bring I will decide which of you is wisest.”

All three sons went to the market in search of something to satisfy their father’s demands. When they returned the father gathered them in his bedroom.

The first son put down pieces of cloth that he had bought and laid them end to end across the room, but it barely covered any of the floor.

The second son laid down hay but there was only enough to cover part of the floor.

The third son showed his father what he had purchased and the father announced, “You are truly the wisest and will inherit my land.”

What did the third son bring?

A match.

Posted in Brain Teasers

What Do These Dates Have In Common?

What do these dates have in common?

15 February 1984
2 July 1983
16 December 1983

They all fall in the middle.
15 February was the middle of February (1984 being a leap year).
2 July was the middle day of the year 1983.
And 16 December was the middle of December.

Posted in Brain Teasers