You have two rectangular wires.

Both of them have property that when you light the fire from one end , it will take 60 minutes to get completely burn.

However, they do not burn at consistent speed (i.e it might be possible 1st 20% burn in 50 minutes and 80% can burn in 10 minutes).

So how could you measure 45 minutes ?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

How can you make number one disappear by adding something to it?

I get hot but I never sweat,
I cook food but I am not a chef,
I have a door but you can't enter me,
I have a light but I am not a lamp.
Who am I?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

The Little ant seems to be always confused. Do you know why?

What has many keys but can’t open a single lock?