What is the word or phrase?

what one word does the below rebus identifies?

With the help clues provided in the image, can you find the 5 digit key?

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?

Find the next number in the series below

21 32 54 87 131 ?

What came first, the chicken or the egg?

If 21x = 79x, what is the value of x?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

In the image given, you can find several triangles. Can you count them all?

Jack and Joseph are well-known golf rivals. One Day during a match, they were level at a score of 30. Jack hit a bad shot and Joseph added 10 to his score. Joseph then hit an awesome shot and he won the game.

How ?