Definition: In this task, you are given a question and a context passage. You have to answer the question based on the given passage.
Input: What were they doing when they found the signal?, Context: Initially, the station's range was officially a 40 kilometres radius of the Alexandra Palace transmitter—in practice, however, transmissions could be picked up a good deal further away, and on one occasion in 1938 were picked up by engineers at RCA in New York, who were experimenting with a British television set.
Output:
experimenting with a British television set