所以耗时 $t = 60$ 秒。

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• 行进次数为 $2 \times 15 = 30$ 次（前后两次/搬运一次），
• 若速度恒定，且每次搬运耗时相同，设每次耗时 $t$ 秒，
• 则 $15t = 900$ 米，
• 机器人单程速度为 **1 米/秒**。
• ### 高等055：概率题
• 底半径 $r = 6$ cm

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