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: Within the region originally demanded from Czechoslovakia by Nazi Germany in 1938 was an important railway junction city of Bohumin. The Poles regarded the city as of crucial importance to the area and to Polish interests. On 28 September, Benes composed a note to the Polish administration offering to reopen the debate surrounding the territorial demarcation in Tesinsko in the interest of mutual relations, but he delayed in sending it in hopes of good news from London and Paris, which failed to come. Benes then turned to the Soviet leadership in Moscow, which begun a partial mobilisation in eastern Belarus and the Ukrainian SSR and threatened Poland with the dissolution of the Soviet-Polish non-aggression pact. Nevertheless, the Polish leader, Colonel Jozef Beck believed that Warsaw should act rapidly to forestall the German occupation of the city. At noon on 30 September, Poland gave an ultimatum to the Czechoslovak government. It demanded the immediate evacuation of Czechoslovak troops and police and gave Prague time until noon the following day. At 11:45a.m. on 1 October the Czechoslovak foreign ministry called the Polish ambassador in Prague and told him that Poland could have what it wanted. The Polish Army, commanded by General Wadysaw Bortnowski, annexed an area of 801.5km with a population of 227,399 people. The Germans were delighted with this outcome. They were happy to give up a provincial rail centre to Poland; it was a small sacrifice indeed. It spread the blame of the partition of Czechoslovakia, made Poland an accomplice in the process and confused the issue as well as political expectations. Poland was accused of being an accomplice of Nazi Germany - a charge that Warsaw was hard put to deny.
what and when the region originally demanded from Czechoslovakia by Nazi Germany?