This is a famous interview puzzle .I’ve heard many candidates asked this puzzle or some variant of this puzzle in the interview.
Problem :You are given two candles of equal size, which can burn for 30 minutes each. You have to measure 45 minutes with
these candles. (There is no scale or clock ).There’s no way you can measure the height of candle . Also u r given a lighter.
The solution is very simple try to think before viewing the answer
Here’s a variant of this puzzle :
Problem :You are given two candles of equal size, which can burn 1 hour each. You have to measure 90 minutes with