There is a candle which is becoming short at a fixed rate when setting fire to the candle.
I was going to investigate in how many minutes it would be burned out when fire is set to this candle.
Since I wanted to go to a toilet suddenly 6 minutes after beginning observation, I extinguished fire once and went to a toilet.
Then, after returning from the toilet, I set fire once again 5 minutes after extinguishing fire exactly and I continued observation.
The change of the length of the candle became as the graph.
Answer the following questions.
(1) Find the length of the candle 21 minutes after setting fire first.
(2) Find the time when the length of the candle becomes 3 cm after setting fire first.
I was going to investigate in how many minutes it would be burned out when fire is set to this candle.
Since I wanted to go to a toilet suddenly 6 minutes after beginning observation, I extinguished fire once and went to a toilet.
Then, after returning from the toilet, I set fire once again 5 minutes after extinguishing fire exactly and I continued observation.
The change of the length of the candle became as the graph.
Answer the following questions.
(1) Find the length of the candle 21 minutes after setting fire first.
(2) Find the time when the length of the candle becomes 3 cm after setting fire first.
Answer
(1) 10 cm
(2) 35 minutes
(2) 35 minutes
