cleanlogicmathA 400 yard long train, travelling at 30 mph, enters a 4.5 mile long tunnel.
How long will elapse between the moment the front of the train enters the tunnel and the moment the end of the train clears the tunnel?

9 minutes and 27.2727 seconds.

## Similar riddles

See also best riddles or new riddles.

logicmathshortFind three positive whole numbers that have the same answer added together or when multiplied together.

1,2, & 3.
1 x 2 x 3 = 6 and 1 + 2 + 3 = 6

animallogicmathYou just bought a cute rabbit at a pet store. The rabbit can breed once every month, and deliver 7 babies at a time. How many rabbits do you have after 12 months?

One, it takes two rabbits to breed.

logicmathA train leaves from Halifax, Nova Scotia heading towards Vancouver, British Columbia at 120 km/h. Three hours later, a train leaves Vancouver heading towards Halifax at 180 km/h. Assume there's exactly 6000 kilometers between Vancouver and Halifax. When they meet, which train is closer to Halifax?

Both trains would be at the same spot when they meet therefore they are both equally close to Halifax.

cleanlogicmathshortHow many sides does a circle have?

Two. The inside and the outside.

cleanlogicshortWhen does Halloween come before Valentine's day?

In a dictionary.

cleanlogicFind words to fit the clues, all the words end in the same three letters.
_ _ _ _ _ _ Eat quickly
_ _ _ _ _ _ Unverified story
_ _ _ _ _ _ _ An outline

Devour, rumour and contour.

cleanlogicshortA hundred feet in the air, but it's back is on the ground. What is it?

A Centipede that turned upside down.

cleanlogicshortYou can see me in water, but I never get wet. What am I?

Reflection.

interviewlogicmathThe Miller next took the company aside and showed them nine sacks of flour that were standing as depicted in the sketch.
"Now, hearken, all and some," said he, "while that I do set ye the riddle of the nine sacks of flour.
And mark ye, my lords and masters, that there be single sacks on the outside, pairs next unto them, and three together in the middle thereof.
By Saint Benedict, it doth so happen that if we do but multiply the pair, 28, by the single one, 7, the answer is 196, which is of a truth the number shown by the sacks in the middle.
Yet it be not true that the other pair, 34, when so multiplied by its neighbour, 5, will also make 196.
Wherefore I do beg you, gentle sirs, so to place anew the nine sacks with as little trouble as possible that each pair when thus multiplied by its single neighbour shall make the number in the middle."
As the Miller has stipulated in effect that as few bags as possible shall be moved, there is only one answer to this puzzle, which everybody should be able to solve.

The way to arrange the sacks of flour is as follows: 2, 78, 156, 39, 4. Here each pair when multiplied by its single neighbour makes the number in the middle, and only five of the sacks need be moved.
There are just three other ways in which they might have been arranged (4, 39, 156, 78, 2; or 3, 58, 174, 29, 6; or 6, 29, 174, 58, 3), but they all require the moving of seven sacks.

cleanlogicYou are in a cabin and it is pitch black. You have one match on you. Which do you light first, the newspaper, the lamp, the candle, or the fire?

You light the match first!