Mile Long Train Riddle
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?
Hint:
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. Did you answer this riddle correctly?
YES NO
YES NO
Outrunning A Train Riddle
Walking home one day, you take a short cut along the train tracks. The tracks cross a narrow bridge over a deep gorge. At the point you are 3/8 of the way across the bridge, you hear the train whistle somewhere behind you. You charge across the bridge, and jump off the track as the train is about to run you down. As it happens, if you had gone the other way, you would have reached safety just before being run over as well. If you can run ten miles per hour, how fast is the train moving?
Hint:
The train is moving at 40 miles per hour. Imagine that a friend is walking with you. When the train whistle blows, you head away from the train, he heads toward it. When he reaches safety, you will be 6/8 (or 3/4)of the way across the bridge, and the train will have just reached the bridge. For the train to cross 4/4 of the bridge in the time you cross the remaining 1/4, the train must be moving four times your speed. Did you answer this riddle correctly?
YES NO
YES NO
I Am A Roman God
I have the atomic symbol Hg but Im not hydrogen
Im a metal but Im not gold
Im a liquid but Im not solder
Im a Roman god but Im not Apollo
Im a planet but Im not Mars
Im a metal but Im not gold
Im a liquid but Im not solder
Im a Roman god but Im not Apollo
Im a planet but Im not Mars
Hint:
Two Chemistry Students Walk Into A Bar
Two chemistry students walk into a bar.
The first says, "I'll order an H2O."
The second then says, "I'll order an H2O too."
Why did the second student die?
The first says, "I'll order an H2O."
The second then says, "I'll order an H2O too."
Why did the second student die?
Hint:
"H2O too" sounds like "H2O2", which is hydrogen peroxide. Hydrogen peroxide is a poison and can be deadly if its concentration in water is sufficiently high. Did you answer this riddle correctly?
YES NO
YES NO
Benzene Ring Riddle
Hint:
Formula Of Water Riddle
Hint:
Cesium And Iodine Riddle
Hint:
CSI. CS is the periodic symbol for cesium and I is the symbol for Iodine. Did you answer this riddle correctly?
YES NO
YES NO
Norse God Riddle
Hint:
Girl's Best Friend.
Hint: Diamonds are made of this element.
Medical Elements Riddle
Hint:
Dangerous Chemicals Riddle
There is a chemical that is very dangerous. If this chemical is inhaled, it may be fatal. Under certain conditions, contact with the skin can cause a burn. However, once a person's body becomes dependent on this chemical, prolonged separation from this chemical can cause death. However, even though many people know of this chemical, and it is found in nearly every drinking source, nothing is being done to try to get rid of it. Why is nothing being done about this chemical?
Hint: This is a real chemical. Think about everything that is being said.
No one does anything about it because the chemical is water. Did you answer this riddle correctly?
YES NO
YES NO
Water And Peroxide Riddle
Hint:
I Can't Be Trusted
Hint:
A Dead Chemist Riddle
Hint:
Head In The Clouds Riddle
Head in the clouds but my feet on the earth
Glowing with fire, people kept a wide berth
Place full of stones, a bush and a rock
(Somewhere to hide, away from the shock)
I must not be touched and of heaven am token
I thundered loud when the tablets were broken
I am in the Bible - what am I?
Glowing with fire, people kept a wide berth
Place full of stones, a bush and a rock
(Somewhere to hide, away from the shock)
I must not be touched and of heaven am token
I thundered loud when the tablets were broken
I am in the Bible - what am I?
Hint:
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