The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

The two towns are exactly 100 km apart. John leaves City A driving at 30 km/hr and Jacob leaves City B half an hour later driving at 60 km/hr. Who will be closer to City A when they meet?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

You see me once in June, twice in November, and not at all in May. What am I?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

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?

What does man love more than life, hate more than death or mortal strife; That which contented men desire; the poor have, the rich require; the miser spends, the spendthrift saves, and all men carry to their graves?

Who is that with a neck and no head, two arms and no hands? What is it?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?