Find the missing letter in the last circle logically in the given below picture.

The Federal bank of London is abducted by the robbers. The head of the robbers asked the cashier to empty their money vault to them and when suddenly cashier got a call from her father. To avoid any suspicion, the robber asked the cashier to pick the call and reply her father in the shortest manner possible.

The cashier told her father "Is there an emergency father, Call me when you are free and I will help you in your furnishing" and then the cashier hung up the phone.

After 10 minutes, police arrived at the crime scene.

How did the police know about the robbery?

Can you circle exactly four of these numbers such that the total is twelve?

1 6 1
6 1 6
1 6 1
6 1 6

How many triangles can you find in this given picture?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

In a football game, Christina defeated Teresa by 2 - 0 but no man from either side scored. How can this be possible?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

I am the fastest animal but cannot climb the tree. What am I?

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?