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lcaovan8
2 năm trước
Một người đi xe máy từ A đến B cách nhau 120 km với vận tốc dự định trước. Sau khi được 1/3 quãng đường AB người đó tăng vận tốc thêm 10 km/h trên quãng đường còn lại.Tim vận tốc dự định và thời gian xe lăn bánh trên đường, biết rằng người đó đến B sớm hơn du định 24 phút.
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