TASK DEFINITION: In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.
PROBLEM: The Munich Agreement was a settlement permitting Nazi Germany's annexation of portions of Czechoslovakia along the country's borders mainly inhabited by German speakers, for which a new territorial designation, the 'Sudetenland', was coined. The agreement was signed in Munich, Germany on the early hours of 30 September 1938 (but dated 29 September) after being negotiated among the major powers of Europe, excluding the Soviet Union. The purpose of the conference was to discuss the future of the Sudetenland in the face of demands made by Adolf Hitler. The agreement was signed by Germany, France, the United Kingdom and Italy, but not Czechoslovakia, which was not invited to the conference The Sudetenland was of immense strategic importance to Czechoslovakia, as most of its border defenses and banks were situated there, as well as heavy industrial districts. The Agreement was soon followed by dismemberment of the Czech state.

SOLUTION: when was the munich pact signed what was its importance

PROBLEM: The wavelength is the distance from one peak of the wave's electric field (wave's peak / crest) to the next, and is inversely proportional to the frequency of the wave. The distance a radio wave travels in one second, in a vacuum, is 299,792,458 meters (983,571,056 ft) which is the wavelength of a 1 hertz radio signal. A 1 megahertz radio signal has a wavelength of 299.8 meters (984 ft).

SOLUTION: the wave length of radio wave is 1m its frequency is

PROBLEM: A roller coaster is a type of amusement ride that employs a form of elevated railroad track designed with tight turns, steep slopes, and sometimes inversions. People ride along the track in open cars, and the rides are often found in amusement parks and theme parks around the world. LaMarcus Adna Thompson obtained one of the first known patents for a roller coaster design in 1885, related to the Switchback Railway that opened a year earlier at Coney Island. The track in a coaster design does not necessarily have to be a complete circuit, as shuttle roller coasters demonstrate. Most roller coasters have multiple cars in which passengers sit and are restrained. Two or more cars hooked together are called a train. Some roller coasters, notably wild mouse roller coasters, run with single cars.

SOLUTION:
when was the first ever roller coaster built