Brain Teaser

Puzzle: There is a house with four walls. Each wall faces south. There is a window in each wall. A bear walks by one of the windows....

Solution: -> 1. + 2. - 2 min <- 1. - 1 min -> 3. + 4. - 9 min <- 2. - 2 min -> 1. + 2. - 2 min Total ...

Question: There are four people at the end of bridge. They take following time to cross the bridge: 1st: 1 min 2nd: 2 min 3rd: 7 mi...

Solution: Take 2 ropes R1, R2. Light R1 at both ends and R2 at one end. When R1 is completely burned (30 minutes have passed), light R...

Question: there are unlimited ropes of same length and if we burn them it will take 1 hour. How to measure 45 mins?