aminsaad3317 aminsaad3317
  • 07-01-2019
  • Physics
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Một chiếc thuyền có tốc độ 15 km / h trong nước tĩnh lặng đi 30 km về phía hạ lưu và trở lại trong tổng cộng 4 giờ 30 phút. Tốc độ dòng chảy (theo km / h) là:

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desirea17 desirea17
  • 18-01-2019
I don't know this answer
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