This task involves creating questions from a given passage that involve some kind of complex reasoning (including numerical reasoning). 
The generated questions must require looking at more than one part of the passage to answer. Try to use a variety of reasoning types in your questions (some of the sample reasoning types are illustrated in the 'positive examples' field) and also have a variety of answer types (spans, numbers, dates). A span is a continuous phrase taken directly from the passage or question. In such questions, the answer spans are recommended to be five words. Questions with answer type "number", are expected to start with "How many". For instance, "How long did an event last?" can be phrased as "How many years did an event last?". To increase diversity, try to create more questions for which the answer will be multiple spans. Please create questions that require AT LEAST 2 arithmetic operations as illustrated in the 'positive examples' field. You are encouraged to try DIFFERENT COMBINATIONS of operations and not just limit to the combinations shown in those examples. The more challenging questions you create, the better it is.
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Question: Passage: The Lines of Communication were English Civil War fortifications commissioned by Parliament  and built around London between 1642 and 1643 to protect the capital from attack by the Royalist armies of Charles I. In 1642 some basic fortifications were built, in the form of street barricades and small earthworks. In 1643 a major construction effort was made, to provide a comprehensive ring of fortifications around the city. Much of the work was done by volunteer labour, organized by the trained bands and the livery companies. Up to 20,000 people are thought to be involved, and the works were completed in under two months. The fortifications failed their only test when the New Model Army entered London in 1647, and they were levelled by Parliament the same year.

Answer: How many months did it take them to build The Lines of Communication?


Question: Passage: In the 1840s Nicholas I of Russia reduced 64,000 szlachta to commoner status. Despite this, 62.8% of Russias nobles were szlachta in 1858 and still 46.1% in 1897. Serfdom was abolished in Russian Poland on February 19, 1864. It was deliberately enacted in a way that would ruin the szlachta. It was the only area where peasants paid the market price in redemption for the land (the average for the empire was 34% above the market price). All land taken from Polish peasants since 1846 was to be returned without redemption payments. The ex-serfs could only sell land to other peasants, not szlachta. 90% of the ex-serfs in the empire who actually gained land after 1861 were in the 8 western provinces. Along with Romania, Polish landless or domestic serfs were the only ones to be given land after serfdom was abolished. All this was to punish the szlachtas role in the uprisings of 1830 and 1863. By 1864 80% of szlachta were déclassé (downward social mobility),  petty nobles were worse off than the average serf, 48.9% of land in Russian Poland was in peasant hands, nobles still held 46%. In the Second Polish Republic the privileges of the nobility were lawfully abolished by the March Constitution (Poland) in 1921 and as such not granted by any future Poland law.

Answer: By how many percent did szlachtas decrease from 1858 to 1897?


Question: Passage: Sector North In the Ogulin area of the HV Karlovac Corps AOR, the 99th Brigade, reinforced by the 143rd Home Guard Regiments Saborsko Company, moved towards Plaški at 5 a.m., but the force was stopped and turned back in disarray by 6 p.m. The 143rd Home Guard Regiment advanced from Josipdol towards Plaški, encountering minefields and strong ARSK resistance. Its elements connected with the 14th Home Guard Regiment, advancing through Barilović towards Slunj. Near the city of Karlovac, the 137th Home Guard Regiment deployed four Reconnaissance around midnight of 3&ndash;4 August, followed by artillery preparation and crossing of the Korana River at 5 a.m. The advance was fiercely resisted by the ARSK 13th Infantry Brigade, but the bridgehead was stable by the end of the day. The 110th Home Guard Regiment, reinforced by a company of the 137th Home Guard Regiment, advanced east to the road leading south from Karlovac to Vojnić and Slunj, where it met heavy resistance and suffered more casualties to landmines, demoralizing the unit and preventing its further advance. In addition, the attached company of the 137th Home Guard Regiment and the 104th Brigade failed to secure the regiments flanks. The 104th Brigade tried to cross the Kupa River at 5 a.m., but failed and fell back to its starting position by 8 a.m., at which time it was shifted to the bridgehead established by the 110th Home Guard Regiment. A company of the 99th Brigade was attached to the 143rd Home Guard Regiment for operations the next day, and a 250-strong battlegroup was removed from the brigade and subordinated to the Karlovac Corps directly.

Answer:
How many hours after the 137th Home Guard Regiment deployed four Reconnaissance did they cross the Korana river?