Spot what is wrong here in below Picture?

Why did the Girl throw the butter out of the window?

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?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

You can see three almost identical images below. Can you spot the odd one out from them?

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

I have branches, but no fruit, trunk or leaves. What am I?

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.