question: At a point during the flight, a plane is 42 kilometres south and 57 kilometres west of the airport it left from.
  
  
  Find the size of the angle marked b to one decimal place.
query_wo: Please directly answer the question and provide the final value, e.g., 1, 2.5, 300.
  Question: At a point during the flight, a plane is 42 kilometres south and 57 kilometres west of the airport it left from.
  
  
  Find the size of the angle marked b to one decimal place.
query_cot: Please first conduct reasoning, and then answer the question and provide the final value, e.g., 1, 2.5, 300, at the end.
  Question: At a point during the flight, a plane is 42 kilometres south and 57 kilometres west of the airport it left from.
  
  
  Find the size of the angle marked b to one decimal place.
question_for_eval: At a point during the flight, a plane is 42 kilometres south and 57 kilometres west of the airport it left from.
  
  
  Find the size of the angle marked b to one decimal place.