Hai nguoi di xe dap cung khoi hanh mot luc cung mot dia diem; nguoi thu nhat di ve phia nam,nguoi thu hai di ve phia tay?Sau 4h hai nguoi cach nhau 100km theo duong chim bay.Tinh van toc cua moi nguoi, biet rang van toc nguoi thu nhat nho hon van toc nguoi thu hai la 5km/h. 

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