instruction:
You are given a background paragraph that describes one or more causal or qualitative relationships such as a relationship in economics or a scientific law and a story that makes use of the concepts or the relationship described in the provided paragraph. You need to come up with a question about the story that requires an understanding of the relationship described in the background paragraph. The generated question should not be answerable without both the background and story. Write a question about the story that requires a relationship in the background paragraph to answer. Check whether your question requires both the background paragraph and the story to answer. If your question can be answered by only one of these, try to rewrite your question so that it requires both. Note that "flipping" a word in the question can give rise to a new question where the answer will be different from the original question. Often, "flipping" a word gives rise to flipping the direction of the relationship, for example, from "increase" to "decrease."
question:
Background Paragraph: Storing large volumes of data – When storing XML to either file or database, the volume of data a system produces can often exceed reasonable limits, with a number of detriments: the access times go up as more data is read, CPU load goes up as XML data takes more power to process, and storage costs go up. By storing XML data in Fast Infoset format, data volume may be reduced by as much as 80 percent. 
Story: Porfirio had a busy day storing XML. At 9 AM, he stored 203 Gigabytes to the database. At 10 AM, he stored 303 Gigabytes to the database. At 11 AM, he stored 403 Gigabytes to the database. At 12 PM, he got lunch. At 1 PM, he stored 503 Gigabytes to the database. At 2 PM, he stored 603 Gigabytes to the database. At 3 PM, she went to sleep to finish storing XML later that night.
answer:
What time did storage costs go up:  1 PM or 12 PM?


question:
Background Paragraph: New species develop naturally through the process of natural selection . Due to natural selection, organisms with traits that better enable them to adapt to their environment will tend to survive and reproduce in greater numbers. Natural selection causes beneficial heritable traits to become more common in a population and unfavorable heritable traits to become less common. For example, a giraffe’s neck is beneficial because it allows the giraffe to reach leaves high in trees. Natural selection caused this beneficial trait to become more common than short necks. 
Story: Two different islands had animals evolving in different ways. Big island had new species develop naturally through natural selection, while Low island did not.
answer:
Which island didn't experience natural selection?


question:
Background Paragraph: In common everyday speech, speed of sound refers to the speed of sound waves in air. However, the speed of sound varies from substance to substance: sound travels most slowly in gases; it travels faster in liquids; and faster still in solids. For example, (as noted above), sound travels at 343 m/s in air; it travels at 1,480 m/s in water (4.3 times as fast as in air); and at 5,120 m/s in iron (about 15 times as fast as in air). In an exceptionally stiff material such as diamond, sound travels at 12,000 metres per second (27,000 mph);[1] (about 35 times as fast as in air) which is around the maximum speed that sound will travel under normal conditions. 
Story: A popular radio station was playing the classic rock songs. There was a radio in a car with a lot of obstacles between the station. There was a fire with a lot of smoke, a river, and a mountain. The man driving the car had a great time listening to the classics.
answer:

Where was the radio signal traveling at the quickest speed: river or mountain?