小明和小亮做加法游戏离小亮680米小明和小亮做加法游戏对小亮大喊一生。求经多少秒小亮听到小明和小亮做加法游戏的声音？（空气温度15度）

来源：蜘蛛抓取(WebSpider) 时间：2014-10-18 06:19 标签： 一天早上小明看见小亮
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