2 bến sông AB cách nhau 60km. 1 chiếc thuyền từ bến sông A đến bến sông B rồi quay về A với tổng thời gian là 2h30'. Xem vận tốc của nước là 5km/h và ko đổi trong suốt quá trình chuyển động . Tìm vận tốc thuyền đối với nước. Giúp mink vs nha cảm ơn các bạn mink hứa sẽ vote cho 5 sao nha 😊😊😊😊

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