TASK DEFINITION: In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.
PROBLEM: Article: Researchers around the world have been trying their hand at making better use of the huge amount of wind energy available in nature to produce clean energy. Apart from this, studies are being carried out to harness usable wind energy produced by man-made technologies. One useful source identified by Indian inventor Santosh Pradhan about two years ago is a speeding train, which produces fierce wind that can be transformed into electricity. According to Pradhan's proposal, with a few small improvements in existing trains running in Mumbai, the largest city in India, at least 10,000 megawatts of electricity could be harvested each day. Building on this principle, designers Ale Leonetti Luparinia and Qian Jiang from Yanko Design have created a device called T-Box that harnesses wind energy from speeding trains. T-Box can be placed within the railway tracks. It is half-buried underground between the concrete sleepers , which does not disturb the normal train operating at all. According to Yanko, around 150 T-Boxes can be fitted along a 1,000-meter railway track. A train running at a speed of 200 kph can produce winds blowing at 15 miles a second. Based on this calculation, 150 T-Boxes can produce 2.6 KWH of electricity per day. The T-Box's design won a silver medal in last year's Lite-On Awards and was exhibited last summer at the Xue Xue Institute in Taipei, Taiwan Province. Though the figures look impressive, it is important to remember that the design is still at a conceptual stage and hasn't taken into account issues such as pieces of waste material produced by the device and the efforts and costs involved in the maintenance of the device. We can expect the technology to see the light of the day only after it clears these issues. If so, rail travel, one of the greenest forms of travel, will become greener and more energy-efficient.
Answer: It is based on Pradhan's idea.

SOLUTION: What can we learn about T-Box?

PROBLEM: Article: Almost all of us have been there: A sense of uneasiness strikes us when we see the battery running low on the smartphone. While today's smartphones enable us to surf the Internet, take pictures and play music, their limited, sometimes annoyingly short battery life has started to make people full of memories of early models. "My favorite phone of all time was a silver Nokia 6310i from the early 2000s. It may be primitive by today's standards, but it could run for 17 days on a single charge," wrote Daily Mail columnist David Derbyshire. But scientists spend no time thinking about the past. They have built an aluminium battery which could be a cheap, fast-charging alternative to current designs. You can squeeze, and practically bend it in half without breaking the packet. It is more environmentally friendly than alkaline batteries, and more safe than lithium batteries - it won't catch fire "even if you drill through it", as Hongjie Dai of Stanford University told The Telegraph. The battery is the work of a team led by Dai. And the best part is that it has a recharge time of around one minute. However, at present, the only problem is that it produces just half the voltage of a typical lithium battery. But Dai explained they were setting about changing the voltage and energy density ". "Our battery has everything else you'd dream that a battery should have. I see this as a new battery in its early days," he told The Telegraph.
Answer: 5

SOLUTION: How many advantages does the aluminium battery have according to the article?

PROBLEM: Article: Hilton Shanghai, the city's first international hotel, has been recognized as a top business hotel in Shanghai for its convenient location and outstanding facilities for more than 20 years. However, the hotel's newly appointed general manager Gerd Knaust says it is the people that make the hotel successful. More than 380 employees have been working with the hotel for more than 15 years. Some of them have personal relationships with customers. ''It's a people-relation business,'' Knaust says. ''They really tell me about the stories in the last 15 years. It's something very nice to listen to. It's also a lasting memory for the guests.'' In fact, over the years, some of the guests have stayed in the hotel 200 or even 300 times. Knaust, who has been working in the hospitality industry for more than 30 years, started his career as a chef in Germany. During his early 30s, Knaust already moved to the top in the culinary field as director of kitchen of Hyatt Regency Cologne in Germany. After holding several general manager positions in Mandarin Oriental hotels, Knaust joined Hilton International as the general manager to open the Conrad and Doubletree by Hilton at Haitang Bay, Sanya in 2010. When he was appointed as the general manager of Hilton Shanghai in November, he not only was heavily involved in recruitment, sales and marketing strategies but also he worked closely with the food and beverage team to develop the hotel's restaurant concepts and menus. ''I believe that we should offer quality and healthy food.'' he says. Knaust believes that a hotel must value the customers' comments on Ctrip, Trip Advisor and other platforms, etc. ''It keeps us more on guard to be 100 percent professional,'' he says.
Answer: Because of its location, facilities and good service.

SOLUTION:
Why do business travelers choose Hilton Shanghai?