What do you answer even though it never asks you questions?

I want to fill my bucket using both cold and hot water.
I have two taps for both cold and hot water. The hot water tap fills the bucket in exact 6 hours and the cold water tap fills the bucket in exact 4 hours.
I turn both of them simultaneously but I forgot to turn off another tap which removes the water out of the bucket. This tap can empty the bucket in 12 hours.

How Long will it take to fill the bucket?

I am a word that begins with the letter “i.” If you add the letter “a” to me, I become a new word with a different meaning, but that sounds exactly the same. What word am I?

How many times in a given day, minutes and hour clock comes in a straight line ?

What time is it when an elephant sits on a fence?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

What number comes next in the series?

5 15 5 18 5 24 14 20 _

How many times can you subtract the number two from the number fifty?

I can write cow in 13 letters.

Can You?