Brain Teaser
Buford needs to
boil an egg for exactly 7 minutes. Any longer and it will
be too tough to eat without teeth. Any less, and it will
spill when he cracks it.
Unfortunately, the only
time pieces he has in his trailer are three hourglasses.
He has a 9-minute, an 11-minute and a 14-minute
hourglass.
How in tarnation can
he boil an egg for exactly 7 minutes using those three
hourglasses?
Give up? . . . check the answer.