How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

Let's play a word game. Following are some meaningless words that can be completed by adding random letters on either side of the word.

For example, the word "rdo" can be formed into "pardon".

Using the same technique, can you complete the given words?
ecalc
airb
rinci
tibac
uidel
gorit
igna
eyho

Two trains start at the same time, one from Bangalore to Mysore and the other from Mysore to Bangalore. if they arrive at their destinations one hour and four hours respectively after passing one another, how much faster is one train running than the other?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

A bomb exploded in a room full of married couples and no one died. How?

What do the following words have in common?

Assess
Banana
Dresser
Grammar
Potato
Revive
Uneven
Voodoo

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

There is a place where if I stand up straight, I will still be considered sideways.

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

Solve the following series:
AZ, GT, MN, __, YB