| On an early morning you
are paid a visit by a group of dwarves, who have come to enlist your services in locating
some lost treasure. But first, they would like breakfast. Though you currently have no
electricity (thanks to a massive storm the previous evening), there is still an old wood
stove with which you can prepare most of the professors' breakfasts. However one eccentric
dwarf with a great deal of power and influence has a peculiar breakfast item which now
poses a problem. He likes a single egg boiled for exactly nine minutes. You aren't wearing your watch, and all the clocks in the building are
electric. You are able to locate two hourglasses, able to precisely measure seven and four
minutes, respectively.
How quickly using only these two hourglasses can you
provide the dwarf with his egg?
-[answer]- |
