If it took eight men ten hours to build a wall, how long would it take four men to build it?

In the four images below, can you find the odd one out?

What does below chemistry rebus means?

You are a cab driver who pools passengers. You pick 3 people from a destination and drop 1 after an hour. 2 people climb aboard at the same time and you drop 3 at the next destination. After some time, you pick 2 passengers only to drop 1 after a short distance where 3 more passengers climb up the cab. You leave the rest of the passengers one by one to their destination and then come back home.

Can you tell the eye color of the cab driver?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

How many triangles can you find in this given picture?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?