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/ 行进次数为 $2 \times 15 = 30$ 次（前后两次/搬运一次），
行进次数为 $2 \times 15 = 30$ 次（前后两次/搬运一次），
February 22, 2026
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#### 15 cm, 54 cm²
#### 11,044.86
#### 77.14### 高等045：计算题
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，
所以耗时 $t = 60$ 秒。
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