Riddles

There's 2 hourglasses, one setting a time for exactly 2 minutes, the other for exactly 5 minutes.

You need to boil an egg for exactly 3 minutes. How will you do this by only using the 2 hourglasses?



A1: Set the two hourglasses at same time, let the 2minute run out twice (leaving 1 minute left for the 5 minute hourglass). Then put the egg in. when the 5 minute hourglass runs out, set the 2 minute hourglass and when that runs out, the egg will boil for 3 minutes.

A2: Set both hourglasses at same time. When the 2 minute hourglass runs out, drop the egg and wait till the 5 minute hourglass runs out.

Are there more answers?