Instructions: In this task, you're given a question, along with three passages, 1, 2, and 3. Your job is to determine which passage can be used to answer the question by searching for further information using terms from the passage. Indicate your choice as 1, 2, or 3.
Input: Question: How many months did the war that preceded the building of the Frankfurt-Bebra railway last? Passage 1:Coal mining in the Midlothian area of Chesterfield County began in the 18th century. Around 1701, French Huguenot settlers to the area discovered the existence of the coalfield. The coalfield was part of the Richmond Basin which is one of the Eastern North America Rift Basins which contains some sedimentary rock and bituminous coal. In a 1709 diary entry William Byrd II, who is credited as the founder of Richmond, and had purchased of land in the area where coal was found, noted that "the coaler found the coal mine very good and sufficient to furnish several generations." It was first commercially mined in the 1730s, and was used to make cannon at Westham (near the present Huguenot Memorial Bridge) during the American Revolutionary War.
Passage 2:The government of the Electorate of Hesse (Kurhessen) had begun building the FrankfurtBebra railway from Bebra in North Hesse to Fulda, Hanau and Frankfurt before its annexation by Prussia after the Austro-Prussian War of 1866. The project was completed by the Prussian state railways on 15 December 1868. Until the opening of the line south of the Main, trains from Bebra to Frankfurt had to use the North Main line and the Frankfurt City Link Line. On 15 November 1873 the new line south of the Main between Hanau and Frankfurt via Sachsenhausen and Offenbach was opened, including South Station (opened as Bebraer Bahnhof, "Bebra line" station) and Offenbach Hauptbahnhof. The South Main line is still the most important rail link connecting Frankfurt with Leipzig, Berlin and Hamburg.
Passage 3:Robert Elwes travelled extensively in his twenties and thirties, but in 1848 he embarked on a journey that was to take him round the world. Robert Elwes, aged 28, left England on 20 March 1848 on board the Eclipse. This voyage around the world took two years and three months, sailing on 10 different ships. He painted and sketched many scenes on his journey. He arrived in Rio de Janeiro, Brazil, having crossed the Atlantic from Tenerife in 30 days. He explored a little of Brazil and then sailed to Buenos Aires, Argentina. He crossed the Pampas on horseback, a journey of 1,000 miles, crossing the Andes by mule and up the Pacific coast to Lima. He sailed across the Pacific to Honolulu and Tahiti and was shipwrecked off Tasmania in September 1849. Rescued by sealers and taken to Hobart with a cargo of 500 sheep, he then travelled overland across Tasmania to Launceston where he sailed (nervously) for Australia.

Output:
2