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Date: Fri, 31 May 96 09:13:36 From: John Hi At time0 start both timers, and begin to cook the egg. Total of 2 flips. I agree that this doesn't (and can't) beat the one-flip solution, but it does allow the egg to be cooked given the cost of energy, and the fact that our need to purchase oil from other nations is a leading contributor to our nation's trade deficit problem! However, given that this is the age of electronics, my solutions's drawback is that it TRULY requires 'hour-glasses'. That is, chronographs would not support my solution since it requires the device to count up as wellimmediately- not wait 7 minutes as Solution #3 requires. This of course is a big advantage as down at the same time. (the bottom sand is counting from 0 to 7 min, while the top sand is counting down from 7min to 0) Unless, the chronograph had both an up and down function, as many of today's Sport watches have; this is because sports clocks count time-remaining, not time-elapsed. But of course, if you were using a watch, or equivelent, you would simply time 15 minutes directly! But that wouldn't make much a puzzle now either. Hope you enjoyed my light-hearted and long-winded resolution. John
Copyright © 1996-2008 Alexander Bogomolny
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