ho to voi bai toan lop 8!?

giai bai toan sau bang cach lap pt: 1 nguoi di xe dap tu A den B xuat phat tu luc 7h di voi van toc 12km/h.den B nguoi do nghi? 1h30 min.roi ­quay lai A luc 9h15min.voi van toc 15km/h.tinh quang duong AB.

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