Madeline has two different candles made by two different companies. The length (in centimeters) of the first candle depends on its burning time t (in hours) according to the formula f(t)=20-1.5t. The length (in centimeters) of the second candle over time t (in hours) is displayed below in the graph 1. Which candle was taller originally? Justify your answer. 2. Which candle loses its height faster when burning? Justify your answer.

3. Madeline lit both candles simultaneously. How long will it take for each candle to burn to the end? Justify your answer.