When my father was 31 I was 8. Now he is twice as old as me. How old am I?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

There is one four-digit whole number n, such that the last four digits of n2 are the original number n

Spot what is wrong here in below Picture?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

What is the unique property of the following words ?
* Revive
* Banana
* Grammar
* Voodoo
* Assess
* Potato
* Dresser
* Uneven

You are given four tennis balls and asked to arrange those balls in a manner that the distance between each one of them is exactly equal. How will you do it?

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?

How far can you walk into the woods?

Which five letter word can be added at the end of below word to form a
valid word?

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