Question: what is the speed of the earth's orbit around the sun
[{'answer': '30 km / s'}, {'provenance': [{'wikipedia_id': '878461', 'title': "Earth's orbit", 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 378, 'bleu_score': 0.85096798500569, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14835987309614297248}, 'section': 'Section::::Abstract.'}]}]