Two candles of the same height are lighted at the same time. The first is consumed in 8hours and the second in 6hours. Assuming that each candle burns at a constant rate, in how many hours after being lighted, the ratio between the first and second candles becomes 2:1.

• 4 4/5 hr.
  
  First candle burns @ 1/8 per hour and Second @ 1/6 per hour
  If after 't' hour the ratio between first and second candle becomes 2:1, then
  [1-(t/8)] /[1-(t/6)]=2/1 or (8-t)/8 / (6-t)/6 =2/1, t=24/5 =4 4/5 hr. or 4 hr. 48 min.
• 8 years agoHelpfull: Yes(7) No(1)