A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

I make two people out of one. What am I?

Through your logical capabilities, can you make 7 an even?

People make me, save me, change me, raise me. What am I?

Prove that the below maths equation is true.

8 + 8 = 91

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

At a party, there are five people and a whole round cake lying at the centre of the table. Only four people will make a cut and take their piece and the last one will get the remaining piece on the table. How can they make sure that everyone gets a 1/5th of the piece?

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?