With the help of the speed propeller, the spacecraft is getting faster and faster. Doug picked up the math book in the living room and read it carefully. Xiao Qiang plays computer in the bedroom, and Xiaowen and Doudou study math together. Tour guides and staff are sweating profusely in the central system control center to operate the spacecraft. At this time, the spaceship suddenly screamed. Doudou, Xiaowen and Xiao Qiang all came to the central system control center and asked, "What's the matter?" The operator said: "No, because the spacecraft flew faster than light for a long time, some power devices were burned." It seems that we have to land. " But which planet in Fiona Fang has life? We are still 2 14 light years away from the volley planet, 497 light years away from the earth and 657 light years away from Qingyun planet. Excuse me, Mr. tour guide, which planet still has advanced life? "The guide thought for a moment and said," Yes, there is, but it's a little far. That planet is a purple planet. " Doug asked, "What? Self-destructive planet? Will this planet destroy itself? " The tour guide shook his head and said, "It's not a self-destructive planet, it's a purple planet. This planet also has advanced life, and their technology is similar to that of the earth. However, we are now 60 light-years away from the Purple Planet. I don't know whether we can get there. "The controller checked the maximum maintenance time, and it showed only 1.9 days. The controller said happily, "Good! Our spacecraft can still fly 1.9 days, and should be able to arrive. What is the relationship between the volley planet and the purple planet? " The tour guide nodded and said, "Good." The controller said, "That's good. We went there and asked the residents there to help repair the spaceship. Let's go on! "Xiao Qiang said," That's a good idea! " So the operator turned around and flew to the purple planet.

One day passed quickly, and in a distant place, I saw a planet painted with blue and purple, that is, the purple planet. The controller sent a request to the Purple Planet Control Center and received a response soon. The request of the Purple Planet is: "If you are an earthman and a volley planet, we welcome you to enter the Purple Planet to repair the spaceship. However, this question must be answered correctly: the earth was illuminated by candles in ancient times. Now there are two new candles of the same length. It takes 2 hours to light all the coarse candles and 65,438+0 hours to light all the fine candles. When these two candles are lit and extinguished at the same time, the length of the remaining thick candle is three times that of the remaining thin candle. How long has the candle been on? Please send the answer to the control center of Zipo planet again for verification. "

Doudou was a little dizzy and said, "These planets, alas, have to do problems." I quit this time, Xiaowen. Didn't you just learn this question from me? You do it! "

Xiaowen nodded and analyzed: "Because when two candles are extinguished at the same time, the length of the remaining thick candle is three times that of the remaining thin candle, so the thick candle can be divided into three parts, the thin candle is 1, and the thick candle is 2 more than the thin candle. According to the conditions of the topic: the burning speed of thin candle is twice that of thick candle, so let's add 4 parts (2 parts ×2) to thin candle and 2 parts to thick candle, so they are exactly equal. Then, the thin candle burns for 4/5 for 60×4÷5=48 (minutes). I can also draw a picture (above). Am I doing the right thing? " Doudou nodded and said, "Exactly! Hurry up! " Then, the controller sends the answer to the Purple Planet Control Center. Soon, it was reported that the verification passed. The operator flew the spaceship to the purple planet crash landing. Can Doudou and his spaceship be repaired? What will happen on their way back? Please watch the next episode-Luz Planet vs Earth, Sky Planet.