It is always ahead of me yet I can never see it. What is it?

Replace the question mark with the correct number in the below-given picture?

You are on a Boat in the mid of a river. You have two cigarettes with you. One of these two you have to light, how will you light the cigarette?

The owner of a popular clothing store comes up with his own method of pricing items. A vest costs $8, socks cost $10, a tie costs $6, and a blouse costs $12. Using the owner’s method, how much would a pair of underwear cost?

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

Find the last number in the series below:

voN luJ yaM raM ---

You can win me and lose me but never buy me
You can not eat me and never want to part with me
I can make you cry or bring you joy
I am not a machine and definitely not a toy
You keep me but i am not forever just yours
You might find me in a case or on a shelf next to a vase
I am hard and i am tall if you bump me i am sure to fall
I am made of different materials and am at many events
If your lucky and fight hard I might be yours
What am I ?

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

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?