Input: Article: The noise-based speed is defined as the exposure that will lead to a given signal-to-noise ratio on individual pixels. Two ratios are used, the 40:1 ("excellent image quality") and the 10:1 ("acceptable image quality") ratio. These ratios have been subjectively determined based on a resolution of 70 pixels per cm (178 DPI) when viewed at 25 cm (9.8 inch) distance. The signal-to-noise ratio is defined as the standard deviation of a weighted average of the luminance and color of individual pixels. The noise-based speed is mostly determined by the properties of the sensor and somewhat affected by the noise in the electronic gain and AD converter.

Now answer this question: Which ratios are employed to calculate noise-based speed?

Output: the 40:1 ("excellent image quality") and the 10:1 ("acceptable image quality") ratio

Input: Article: In January 1920, Tito and his wife made a long and difficult journey home to Yugoslavia where he arrived in September. Upon his return, Broz joined the Communist Party of Yugoslavia. The CPY's influence on the political life of the Kingdom of Yugoslavia was growing rapidly. In the 1920 elections the Communists won 59 seats in the parliament and became the third strongest party. Winning numerous local elections, they gained a stronghold in the second largest city of Zagreb, electing Svetozar Delic for mayor. After the assassination of Milorad Draskovic, the Yugoslav Minister of the Interior, by a young communist on 2 August 1921, the CPY was declared illegal under the Yugoslav State Security Act of 1921. During 1920 and 1921 all Communist-won mandates were nullified. Broz continued his work underground despite pressure on Communists from the government. As 1921 began he moved to Veliko Trojstvo near Bjelovar and found work as a machinist. In 1925, Broz moved to Kraljevica where he started working at a shipyard. He was elected as a union leader and a year later he led a shipyard strike. He was fired and moved to Belgrade, where he worked in a train coach factory in Smederevska Palanka. He was elected as Workers' Commissary but was fired as soon as his CPY membership was revealed. Broz then moved to Zagreb, where he was appointed secretary of Metal Workers' Union of Croatia. In 1928, he became the Zagreb Branch Secretary of the CPY. In the same year he was arrested, tried in court for his illegal communist activities, and sent to jail. During his five years at Lepoglava prison he met Mosa Pijade, who became his ideological mentor. After his release, he lived incognito and assumed numerous noms de guerre, among them "Walter" and "Tito".

Now answer this question: Who became his ideological mentor in prison?

Output: Mosa Pijade,

Input: Article: Some international railway services to Continental Europe were operated during the 20th century as boat trains, such as the Admiraal de Ruijter to Amsterdam and the Night Ferry to Paris and Brussels. The opening of the Channel Tunnel in 1994 connected London directly to the continental rail network, allowing Eurostar services to begin. Since 2007, high-speed trains link St. Pancras International with Lille, Paris, Brussels and European tourist destinations via the High Speed 1 rail link and the Channel Tunnel. The first high-speed domestic trains started in June 2009 linking Kent to London. There are plans for a second high speed line linking London to the Midlands, North West England, and Yorkshire.

Now answer this question: When did local high speed rail service that linked London and Kent begin?

Output:
June 2009