A red candle is 8 inches tall and burns at a rate of 7/10 inch per hour.
A blue candle is 6 inches tall and burns at a rate of 1.5 inch per hour.
After how many hours will both candles be the same height?
The shorter candle burns faster, so the candles will not be the same height (0) until the taller candle burns completely. At 0.7 in/h, that will take ...