question: Two flag posts are erected vertically. Find l, the length of the string (in metres) needed to join the tops of the two posts, correct to one decimal place.
query_wo: Please directly answer the question and provide the final value, e.g., 1, 2.5, 300.
  Question: Two flag posts are erected vertically. Find l, the length of the string (in metres) needed to join the tops of the two posts, correct 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: Two flag posts are erected vertically. Find l, the length of the string (in metres) needed to join the tops of the two posts, correct to one decimal place.
question_for_eval: Two flag posts are erected vertically. Find l, the length of the string (in metres) needed to join the tops of the two posts, correct to one decimal place.