IQ Brain Teaser #75

A candle is lit, and after 10 minutes, it is also lit at the other end. 20 minutes later, the candle is completely melted. If the candle were lit at both ends to begin with, and then one end were extinguished when only half of the candle remained, how long in total would it take for the candle to completely melt? 32.5 minutes 35 minutes 37.5 minutes 40 minutes 42.5 minutes 45 minutes 47.5 minutes 50 minutes 52.5 minutes None of the above view results