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Mot ca no xuoi dong tu A den B voi van toc 15km/gio .Biet van toc cua dong nuoc la 2km/gio va ca no di nguoc dong tu B ve A het 1 gio 30 phut. tinh do dai quang song AB
Tren mot quang song tu ben A den ben B dai 66 km. Van toc dong nuoc la 5 km/gio. Mot ca xuoi dong tu A ve B voi van toc cua ca no la 20km/gio khoi hanh luc 6 gio, cung luc do mot ca no khac nguoc dong tu B ve A voi van toc ca no la 24 km/gio. Hoi den may gio 2 ca no gap nhau
mot ca no di nguoc dong tren quang song AB dai 65,8 kmhet 2 gio 48 phut. biet van toc cua dong nuoc la 2,3km/gio,tinh van toc cua ca no khi nuoc lang
mot ca no di nguoc dong tren quang song AB dai 65,8 kmhet 2 gio 48 phut. biet van toc cua dong nuoc la 2,3km/gio,tinh van toc cua ca no khi nuoc lang
quang song ab dai 72km luc 5 gio mot ca mo di tu a xuoi dong den b , nghi tai b 80 phút roi tro ve nguoc dong tro ve a .hoi luc may gio ca no ve toi a . biet rang van toc rieng cua ca no la 25km/h van toc cua dong nuoc la 5km/h
1 ca no nguoc dong quang song ab dai 65,8km het 2 gio 48 fut biet van toc cua dong nuoc la 2,3km/gio tinh van toc cua ca no khi nuoc lang?
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tren 1 quang song tu dien A den B dai 66km,vn toc cua dong nuoc la 5 km/gio 1 ca no xuoi dong tu diem A den B voi van toc ca no la 20 km/gio khoi hanh luc 6 gio cung luc do 1 ca no khac nguoc dong tu B ve A voi van toc cua ca no la 24km/gio hoi den may gio 2 ca no gap nhau
quang duong tu song a den song b dai 48km mot ca no di xuoi dong tu a den b het 1 gio 12 phut va di nguoc dong tu b tro ve a het 1 gio 36 phut ting van toc cua dong nuoc va van toc cua ca no khi nuoc yen lang