Egg-ish puzzles

I had eggs this morning, so I figured some easy puzzles on eggs would fit the occasion...

1. If it takes 10 minutes to hard-boil an egg, how long would it take to hard-boil 3 eggs?
2. What happens if I continue cooking the egg for 20 minutes?
3. Why can't I "roast" the egg directly on fire? (Or can I?)
4. There are two pots, each containing water at boiling temperature. The second pot has twice the amount of water than the first. Now, I add in 3 eggs to each of the pots and start boiling them on the stove. Which set of eggs will be hard boiled first?
5. A boy takes 5 minutes to finish an egg. How many boys are needed to finish 10 eggs in10 minutes?
6. You have two eggs, one pot containing boiling water, and an access to a stove. You are tasked to find out what is the least amount of time needed to completely hard boil an egg. You test this by spinning the egg, and each test takes 1 minute. (Assume that the transition to hardness is stepwise, that is, the contents of the egg can either be in liquid form or solid form, but no "in-between", so test results are deterministic. Also assume that the eggs have "memory" - they remember how long they have been cooked, i.e. if it takes 2 minutes to hard-boil the egg, an egg that was cooked for 1 minute and sent for testing will need just another 1 minute.) You know from past experience that the eggs will definitely be hard boiled after 20 minutes. What strategy should you use so that the least amount of time is spent experimenting?

Good luck!