Two burning ropes - brain teaser
Two burning ropes are needed to measure 45 minutes exactly. each rope takes exactly one hour to burn, but they dont burn at a constant rate. each rope is ma...
A brain teaser is a form of puzzle that requires thought to solve. It often requires thinking in unconventional ways with given constraints in mind; sometimes it also involves lateral thinking. Logic puzzles and riddles are specific types of brain teasers. (source : wikipedia