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derensaito
2 năm trước
Một ca nô đi xuôi dòng với vận tốc 36 km / giờ. Vận tốc của dòng nước là 2,5 km / giờ. a) Nếu đi ngược dòng thì sau 2,5 giờ ca nô đi được bao nhiêu ki-lô-mét? b) Nếu nước lặng thì sau 2 giờ ca nô đi được bao nhiêu ki-lô-mét?
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