Question: what is the size of a speed skating track
[{'answer': '400 meter', 'provenance': [{'wikipedia_id': '31368038', 'title': 'List of indoor speed skating rinks', 'start_paragraph_id': 1, 'start_character': 35, 'end_paragraph_id': 1, 'end_character': 44, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '31368038', 'title': 'List of indoor speed skating rinks', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 628, 'bleu_score': 0.9808590314834971, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2684553804985447531}, 'section': 'Section::::Abstract.'}]}]