You are given a match-box and two candles of equal size, which can burn 1 hour each. You have to measure 90 minutes with these candles. (There is no scale or clock). How do you do?

• First light 1 candle,it will take 1 hour to burn completely then
  light another candle from both the end, so it will burn completely in 30 minutes
  Thus total time of 1hour+30 minutes(=90 minutes) can be measured.
• 11 years agoHelpfull: Yes(10) No(0)