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Harlamova29_29 [7]
3 years ago
13

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:
Physics
1 answer:
Ad libitum [116K]3 years ago
3 0
I don't know this answer
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