I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.

I organized a small get together at my home.
In the party , i have a barrel with some whiskey in it.

Suddenly Guest 1 say 'I bet this barrel of whiskey is more than half full'.
'No, it's less than half full' Guest 2 replied.

I don't have any measuring instrument and without removing whiskey from it , how can i determine which of the guest is right ?

The dirtier I get, the whiter I look. Who am I?

Two prisoners Jack and Jill are locked in a cell.
There is open window approx 40 feet above the ground of the cell.
They are never able to reach there.

Then they plan to escape by a tunnel and they start digging out.
After digging for more than 20 days, Jill comes with the different plan and they escaped.

what was the plan ?

Which Travels Faster? Solve below famous picture riddle:

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

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?