Are you smarter than me?

Question

Solved this problem in about 5 minutes.

10 points to anyone who responds with the correct answer within a 7 minute period.

Here goes:

You need to cook an egg for 15 minutes. You have 2 hour glasses. One has 7 minutes worth of Sand, the other 11 minutes.

Remember, your aim to is cook an egg in 15 minutes using the hourglass.

How do you do this?

Tip:

Simple mathematics.

Answer 1

Start them both at the same time.

When the 7 minute one is up you know there is 4 minutes worth of sand left in the top of the 11 minute one, then restart the 7 minute one and when the 4 minutes is up you know there is 3 minutes left in the 7 minute one.... ah I'm not good with math.

In all honesty it should take about 3 minutes for one egg. You could flip the 7 minute one twice for 14 minutes then count off the last 60 seconds or use a watch or microwave.

Edit: Ok, sorry it was too early in the morning for me to think. You are right Blue, you will have the 7 split into 3 and 4, run the 11 minute one then the 4 minute one for a total of 15 minutes!

Answer 2

Why yes, I am smarter than you..

Answer 3

Just use the 7 minute one twice

Answer 4

Start time the question had been up for thirteen minutes.

Flip both timers, but don't start the cooking.  When the seven minute timer is done, there will be four minutes left on the eleven minute timer.  Start cooking.  Four minutes later, the eleven minute timer will need flipping, giving another eleven minutes of cooking time.  Bingo.  Fifteen minutes.  Stop cooking.

Phew -  only took four minutes to type it.

Edit:  You do know that it's only 3 minutes for soft boiled and 10 for hard boiled, right?

Answer 5

start both at the same time and when the seven minute one is done, there will be 4 minutes left in the 11 minute one so restart the 7 minute one until the last of the 11 minute one runs out 4 minutes later then flip the 7 minute one over so that the four minutes worth of sand that fell will end your 15 minute cooking time

and this ended up being like 4 hours after you asked, not your requested 7 minutes, but i still felt like answering