Easy Riddles and Answers

Question: There are three books on a shelf standing side by side. Each book is 10ml thick. The bookworm eats its way through the first page of the first book to the last page of the last book. How far did the bookworm move if it can only move in a straight horizontal line?

Question: In the books of a famous writter, How many letter in Those Books?

Question: I am full of light but left in the dark. I have a temper that pushes my single sibling. I have many friends very far away and I disappear in the light when it is my sibling's turn to push me back. What am I?

Question: I always listen to my Master, I never disobey. From my path I never stray to destroy what's in my way. What am I?

Question: Something you know nobody knows, and everyone knows something you don't. We all know something, nobody knows everything, and you know something someone doesn't know. What else could nobody know?