What do you answer even though it never asks you questions?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

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?

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

Which country gets ill every time?

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

Why did Navjot Singh Sidhu put the new January calendar in the freezer

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

Two Twins Jack and Jill were standing back to back and suddenly they started running in opposite direction for 4 kilometres and then turn to left and run for another 3 kilometres.

what is the distance between the Baggio twins when they stop ?