Two candles of same height are lighted at the same time The first is consumed in 6 hours and second ...........

Quantitative Aptitude ( CCS) Ratio, Proportion

Two candles of same height are lighted at the same time. The first is consumed in 6 hours and second in 4 hours. Assuming that each candles burns at a constant rate, in how many hours after being lighted, the ratio between the first and second candles becomes 2:1?

1 hour