There are two candles of green and blue colour. Both the candles are of same height are lighted at the same time. The green candle takes 4 hours and the blue candle takes 3 hours to burn completely. If both the candles burn at a constant rate, then in how much time the ratio of the heights of the candles will become 2 : 1.
1
2 hrs. 24 min.
2
2 hrs. 40 min.
3
2 hrs. 12 min.
4
2 hrs.