Which British liner, torpedoed by the German submarine U-20 on May 7, 1915, sank in about 18 minutes?

Which skyscraper, completed in 1931, rises 1,250 feet from sidewalk to roof? Lying about 12,500 feet above sea level, which lake on the Bolivia-Peru border is called the world's highest navigable… Which poet, who lived from 1265 to 1321, described a journey through Hell in his "Inferno"? 128 Americans died when a German U-boat sank which Cunard liner off Ireland on May 7, 1915? In 1281, a "divine wind" saved which nation from a Mongol invasion? In 1290, King Edward I expelled all Jews from which nation? In 1297, Francois Grimaldi, disguised as a monk, seized the fortress of which future principality? What time is it 13 half-hours after 6:30 p.m.?