What is common among 11, 69, and 88?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

These types of puzzles are known as charades. What you have to do is find two words that are referred to in the first stanza and the second stanza and put them together to form the third word in the third stanza.

Just for example, if my first refers to 'off' and my second refers to 'ice', then my whole will be office.

My first is present - future's past -
A time in which your lot is cast.

My second is my first of space
Defining people's present place.

My whole describes a lack of site -
A place without length, breadth, or height.

What is the fastest way to double your money?

What can you see in the middle of March and April that you can never see in any other month?

What kind of band never plays music?

Accidentally, two trains are running in the opposite direction and enter a tunnel that is 200 miles long. A supersonic bird that has fled the lab and taken shelter in the tunnel starts flying from one train towards the other at a speed of 1000 mph. As soon as it reaches the second train, he starts flying back to avoid collision and meets the first train again at the other end. The bird keeps flying to and fro till the trains collide with each other.

What is the total distance that the supersonic bird has traveled till the trains collided?

What does this mean?

CCCCCCC

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.