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.

Passage: Operating out of New London, Connecticut from 1923 to 1925, S-26 visited Saint Thomas, United States Virgin Islands and Trinidad from January to April 1924, and Hawaii from 27 April to 30 May 1925. Cruising from California ports, mainly Mare Island, California, San Diego, California, and San Pedro, California, S-26 visited Hawaii in the summers of 1927-1930. She also served in the Panama Canal area from March to May 1927, and in February 1929. Departing San Diego on 1 December 1930, she arrived at Pearl Harbor on 12 December. From then into 1938, S-26 served at Pearl Harbor. Sailing from there on 15 October 1938, she returned to New London on 25 March 1939. Entering a period of partial duty on 15 April that year, she resumed full duty on 1 July 1940.
How many days did it take S-26 to get from San Diego to Pearl Harbor?

Passage: German civilians were held as "reparations labour" by the USSR. Data from the Russian archives, newly published in 2001 and based on an actual enumeration, put the number of German civilians deported from Poland to the USSR in early 1945 for reparations labour at 155,262; 37% (57,586) died in the USSR. The West German Red Cross had estimated in 1964 that 233,000 German civilians were deported to the USSR from Poland as forced labourers, and that 45% (105,000) were dead or missing. The West German Red Cross estimated at that time that 110,000 German civilians were held as forced labour in the Kaliningrad Oblast, where 50,000 were dead or missing. The Soviets deported 7,448 Poles of the Armia Krajowa from Poland. Soviet records indicated that 506 Poles died in captivity. Tomasz Kamusella maintains that in early 1945, 165,000 Germans were transported to the Soviet Union. According to Gerhardt Reichling, an official in the German Finance office, 520,000 German civilians from the Oder-Neisse region were conscripted for forced labour by both the USSR and Poland; he maintains that 206,000 perished.
How many more people did the West German Red Cross estimate were deported compared to the data from the Russian archives?

Passage: Worldwide sales of hybrid vehicles produced by Toyota reached 1 million vehicles by May 31, 2007, and the 2 million mark was reached by August 2009, with hybrids sold in 50 countries. The 5 million hybrid sales milestone was reached in March 2013. During 2012, Toyota and Lexus hybrid models sold more than 1 million units a year for the first time, with 1.219 million units sold. During 2013, TMC sold 1.279 million units, and the 6 million sales milestone was achieved in December 2013, just nine months after its latest million unit milestone. The 7 million sales mark was reached in September 2014, again, selling one million hybrids in nine months, and the 8 million sales milestone was achieved in July 2015, just 10 months after the previous million-unit milestone. The 9 million sales mark was reached in April 2016, again, selling one million hybrids in just nine months, and the 10 million milestone in January 2017, one more time nine months later. Toyota estimates that up to January 31, 2017, its hybrids have saved about 7.66 billion U.S. gallons of gasoline (29 billion liters) compared to the amount used by gasoline-powered vehicles of similar size, and have emitted approximately 77 million fewer tons of CO2 emissions than would have been emitted by gasoline-powered vehicles of similar size and driving performance.
Did it take longer to go from 6 - 7 million units sold, or from 7 - 8 million units sold?