Our product and our sum always give the same answer. Who are we?

Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

John decided to give his bike 3 coats of paint. Which coat would go on the first?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

Which point will the car reach to go out?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

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?