brain teaser 1

@firelight (1858)
Australia
November 3, 2006 7:51am CST
The boiling egg Suppose you want to cook an egg for exactly 3 minutes. You have only a 5 minute hourglass timer and a 2 minute hourglass timer. Using these 2 timers, how can you boil the egg for exactly 3 minutes?
4 responses
@J_peso (2434)
• United States
3 Nov 06
smil - smil
hmm use both the timers(they are not hourglasses :) ) when the sand in 2 min timer runs out start boiling the eggs b boil till the sand in 5 min timer runs out
1 person likes this
@Tanya8 (1734)
• Canada
3 Nov 06
Start both timers at once. As soon as the 2 minute one is finished, start the egg. There will be 3 minutes of time remaining in the 5 minute timer.
1 person likes this
@RAMPersona (2036)
• Philippines
3 Nov 06
remove the sand from 2 minute hourglass timer. then fill it with the sand from 5 minute hourglass timer. so the 5 minute hourglass timer is now 3 minute hourglass timer.
• Philippines
3 Nov 06
Or if i can't remove the sand from either hourglass timer, i'll just have to start clocking with both hourglasses run simultaneously, then start cooking the egg after the 2 minute hourglass timer runs out of sand.
1 person likes this
@firelight (1858)
• Australia
4 Nov 06
Well done
• Philippines
4 Nov 06
thanks
1 person likes this
@ossie16d (11827)
• Australia
17 Nov 06
Use both timers. When the sand in the 2 minute timer runs through, start boiling the eggs and continue to boil until the sand in the 5 minute timer has run through. Hey presto, 3 minute eggs. LOL