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giangnam2020
2 năm trước
Bài 1: Lúc 7 giờ 50 phút , 1 người đi bộ từ A với vận tốc bằng 5 km/giờ, 1 người đi xe đạp từ B với vận tốc 15km/giờ. Đến 9 giờ 50 phút, họ gặp nhau trên đường a. Chỗ gặp nhau cách A và cách B bao nhiêu ki-lô-mét? b. Quãng đường AB dài bao nhiêu ki-lô-mét? c. Nếu xe đạp tiếp tục đi thì đến A lúc mấy giờ? Giúp mình nhé, mình đang cần gấp lắm
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