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?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

Find the value of "?" in the ball picture Riddle below:

Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

What will you call your mother's brother's brother-in-law?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

I left my campsite and hiked south for 3 miles. Then I turned east and hiked for 3 miles. I then turned north and hiked for 3 miles, at which time I came upon a bear inside my tent eating my food! What colour was the bear?

What is full of holes but still holds water?