Answered

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Một chiếc xe trong 1 giờ đầu chuyển động với tốc độ 20 km/h, trong 4 giờ tiếp theo chuyển động với tốc độ 30 km/h. Tính tốc độ trung bình của xe trên cả quãng đường. *

Sagot :

bur27con

Answer: 50 km/h Tính 5 giờ

Explanation:20 + 30    4 +1

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