What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

I drive at an average speed of 30 miles per hour to the railroad station each morning and catch my train. On a particular morning, there was a lot of traffic and at the halfway point, I had averaged only 15 miles per hour. How fast must I drive for the rest of the way to catch my train?

Fate has decided that you will only be pleased to meet me when you need me

Maybe that is why, when I am working, I start working

However annoying I may be to the regulars, the little ones are always inspired

I will always be waiting if you try to reach me

How many of you can guess my name, let me see

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

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

One day, I thought of ways that can be used for creating a palindrome. So I decided that I will turn into a larger number by adding the reversed digits to the original number and keep doing it till I finally obtained a palindrome.

I am not sure if this process will always result in a palindrome eventually but I was able to produce a four-digit palindrome. Can you guess my starting number?

How many times do a clock's hands overlap in a day ?

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

What is always in front of you but can’t be seen?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.