Thursday, April 15, 2010
Burning Sticks
You have two sticks and matchbox. Each stick takes exactly an hour to burn from one end to the other. The sticks are not identical and do not burn at a constant rate. As a result, two equal lengths of the stick would not necessarily burn in the same amount of time. How would you measure exactly 45 minutes by burning these sticks?
Subscribe to:
Post Comments (Atom)
Burn one stick on one end, and other on both ends. At the end of 30 mins, one stick will be completely burnt, and other will be still burning. Burn the remaining stick from the other end at this time. It will burn completely in another 15 mins, thus making 45 mins total.
ReplyDelete