Reply
Thu 22 May, 2003 07:11 pm
There are two lengths of rope.
Each one can burn in exactly one hour.
They are not necessarily of the same length or width as each other.
They also are not of uniform width (may be wider in middle than on the end), thus burning half of the rope is not necessarily 1/2 hour.
By burning the ropes, how do you measure exactly 45 minutes worth of time?
I am stumped on this one.
You could count to 2700 sec. That's a good approximation.
45 min is 3/4 of one hour.
Watch the rope, when it's 3/4 gone, 45 min is up.
This one stumped me once.
Light both ends of one rope and one end of the other. When the one with both sides lit burns up you have 30 minutes. Now light the other end of the second rope. When it burns up you have 45.
Wowsers. That's cool. :-)
Just no fooling Craven ;/
Actually that riddle is one that DID stump me a few years ago.
New Haven wrote:45 min is 3/4 of one hour.
Watch the rope, when it's 3/4 gone, 45 min is up.
BTW, that won't work because the rope does not burn evenly.
Begin by burning one of the ropes at both ends. When this rope is finished burning (30 minutes), begin burning the other rope from both ends plus the middle. The second rope will take 15 minutes. I'm an new kid on the block.
Rodney :wink:
Texan wrote:Begin by burning one of the ropes at both ends. When this rope is finished burning (30 minutes), begin burning the other rope from both ends plus the middle. The second rope will take 15 minutes. I'm an new kid on the block.
Rodney :wink:
Ain't gonna work, Tex.
Remember, the rope does NOT burn evenly. Lit from both ends, the first rope will burn in 30 minutes, but the second, lit at both ends and at the middle won't take 30 minutes for each half to burn. One half will burn in less than 15 minutes, the other in more than 15 minutes.
8^*
Stumble It!
Tweet This
Bookmark on Delicious
Share on Facebook
Share on MySpace