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Physics, 23.07.2021 14:00 KathyRayG7456

1 người đi quãng đường AB dài 90km. Vận tốc khi đi là 10km/h.Đoạn đường còn lại đi với vận tốc 20km/h. Người đó đi quãng đường AB hết 7h. Hỏi thời gian người đó đi quãng đường với vận tốc 10km

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1 người đi quãng đường AB dài 90km. Vận tốc khi đi là 10km/h.Đoạn đường còn lại đi với vận tốc 20km/...
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