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2 Egg Timers (Difficulty: Easy Peasy to Lemon Squeezy)

Teg Veece · 2006-01-15 12:47:32

With two sand-glass egg timers, one which times out 7 minutes and the other times 4 minutes, how would you time 9 minutes?

15-01-2006 12:47pm

#1

Teg Veece

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With two sand-glass egg timers, one which times out 7 minutes and the other times 4 minutes, how would you time 9 minutes?

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Comments

#2 16-01-2006 8:04pm

Blisterman

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Turn them both at the same time. When the 4 minute runs out, turn it over again immediatly.
When the 7 minute runs out, turn it over. When the 4 minute runs out again, (8 minutes) turn the 7 minutes over, and when it finishes it will have been 9 minutes.

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#3 16-01-2006 11:52pm

Teg Veece

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Well done. What was that Die Hard Puzzle with the water tanks that was similar to this?

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#4 11-02-2006 7:27pm

w66w66

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the one from die hard was, measure four litres with a five litre bottle and three litre bottle.

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