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1 năm trước
Xe khách trung bình chạy từ TP. Cần Thơ đến TP. Hồ Chí Minh đường dài 160km trong thời gian định trước. Chạy được 1/4 quãng đường, khi vào cao tốc xe chạy đã tăng lên gấp 1,2 lần vận tốc ban đầu và đã đến nơi sớm hơn dự định 20 phút. Đố bạn tính được vận tốc lúc đầu của xe?
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