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anhtuanvu00007
2 năm trước
Alvin và Charles đều đi bộ từ Thị trấn Q đến Thị trấn M với vận tốc lần lượt là 4,8 km / h và 5,4 km / h. Bob đạp xe từ Thị trấn M đến Thị trấn Q với tốc độ 10,8 km / h. Nếu cả ba người trong số họ bắt đầu đồng thời, Alvin sẽ gặp Bob 5 phút sau khi Charles gặp Bob. Bob sẽ mất bao nhiêu phút để đi từ Thị trấn M đến Thị trấn Q?
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