Where do you go to learn how to make ice cream?

I cannot talk, but I always reply when spoken to. What am I?

The captain of a ship is telling you an interesting story and then poses a question. He says, “I have travelled the oceans far and wide. One time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly. Can you tell me how that was possible?”

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

Which English verb becomes past tense just by rearranging the letters?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

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

Can you convert the number zero(0) into a positive number using just one mathematical operator ?