I travel all around the world but always stay in the corner. What am I?

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?

Can you find the six hidden animals in the picture below?

Can you find out who is the kidnapper in below Picture and why, Explain ?

Which Travels Faster? Solve below famous picture riddle:

Buy me, smell me or deliver me, I do not change.

Who am I?

Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

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