An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

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

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

What can go up a chimney down, but can’t go down a chimney up?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

How is the moon similar to a dollar?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

A bridge is about to collapse. There are four people P, Q, R and S on one of the sides. Before the bridge collapses, they want to cross it. Now since the bridge is too weak, it can only stand the weight of two people at a time. Also, it is night time and nothing is visible. They have just one torch with them.

Now P takes one minute to cross the bridge, Q takes two minutes to cross, R takes five minutes to cross and S takes ten minutes to cross.

The bridge will collapse in seventeen minutes. How will they be able to cross the bridge before it collapses?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

A Child was born in Lahore, Pakistan.

Still child is not a Pakistani citizen.why ?