10+10 and 11+11 can give you the same answer.

Explain how?

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?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

Suppose you are a girl candidate and sitting in an interview. Suddenly the interviewer asks you, 'What if one morning you wake up and find out that you are pregnant?

How will you reply to such a question?

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle:

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?

I am an odd number. Take away a letter and I become even. What number am I?

Forwards I am heavy, backward I am not. What am I?