When my father was 31 I was 8. Now he is twice as old as me. How old am I?

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 have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

What has to be broken before you can use it?

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

John is 45 years older than his son Jacob. If you find similarities between their ages, both of their ages contain prime numbers as the digits. Also, John's age is the reverse of Jacob's age.

Can you find their ages?