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 complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

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

I can turn polar bears white.
I can make anyone dance.
I can make everyone cry
I can make your hands clap
I can make you thin.
I can make you smile.
I can make you smile

Can you guess the riddle?

If you say my name, I will no longer exist. What am I?

A father's child, a mother's child, yet no one's son.

Who am I?

Solve this riddle by finding the odd one out from the rest.

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?