Can you find out the missing number in the grid?

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?

When can we add 2 to 11 and get 1 as the correct answer?

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

There are two dice with empty faces in front of you and a marker. You can mark any number on each of the faces of the two dice, but you have to display all 31 days of the month using the two of them.

Which numbers will you mark on which dice so that you can easily depict all the dates of the month?

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

Rebus Puzzle Definition: A rebus is an illusion device that uses pictures to represent words or parts of words.
What does This Rebus Puzzle Identify?

Can you count the number of squares in the given picture?

Can you identify the hidden rebus in the image below?

Prove that twice of ten is the same as twice of eleven.