Why is 6 afraid of 7?

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

Create a number using only the digits 4,4,3,3,2,2,1 and 1. So i can only be eight digits. You have to make sure the ones are separated by one digit, the twos are separated by two digits the threes are separated with three digits and the fours are separated by four digits

What number divided by 4 is the same as that number minus 4?

Solve the alphametic puzzle by replacing the alphabet with the number.

S T O R M +
S O L E S
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T O W E L
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A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

A man dies of old age on his 25 birthday. How is this possible?

How many triangles can you count in the figure given?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

Consider all the numbers between 1 and 1 million. Among all these numbers, there is something very special about the number 8 and the number 2202. What is it?