如果一个机器人在仓库中搬运箱子,每次携带3个箱子,需要搬运一定数量的箱子总共15次。在完成任务后,它返回起点,行驶总距离为900米。问机器人单程的速度(单位:米/秒)是多少?(假设机器人速度恒定)


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