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dungki
2 năm trước
Một con thuyền đi với vận tốc 7,2 km/ giờ khi nước lặng , vận tốc của dòng nước là 1,6 km/ giờ . a.Nếu thuyền đi xuôi dòng thì sau 4,2 giờ sẽ đi được bao nhiêu ki- lô mét ? b. Nếu thuyền đi ngược dòng thì cần bao nhiêu thời gian đề đi được quãng đường như khi xuôi dòng trong 4,2 giờ ?
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