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【单选题】
本届“西博会”每天9点开门，但每开早有人排队等候。某一天，从第一个观众来到时起，每分钟来的人数一样多；如果只开3个分场口，9：09分就不再有人排队等候入场，如果开放5个入场口，9：05分就不再有人排队等候入场。则第一个观众的到场时间是（）。A.
7:35
B.
8:15
C.
8:30
D.
8:45
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皮皮学刷刷变学霸
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