Brainteasers asked in Interviews

Sometimes interviewers like to put you on the spot and ask puzzles or brainteasers. The value in these is hard to determine but some feel that it allows them to get a feel for how your mind works (analytically) and how well you face pressure and time constraints.

Here's one for you to try:

You are given two pieces of string that will burn for a total of 3 minutes each. However the burn rate is uneven throughout both strings, so that they will burn quickly at first then slow down then speed back up, but always burns for a total of 3 minutes.

Using just these two pieces of string and a box of matches how can you measure 4 and a half minutes?



ans:lit 1st thread at one end, it finish 3min gone. Now after that lit 2nd thread from both the side. 1.5 min

Note: litting from both side will give you 1.5 min

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