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Apalon4ik [1744] [off]
kater 4 soatdan ko'p bulmagan vaqt davomida daryo oqimi buyicha 22,5 km yuriwi va orqasiga qaytishi kerak.agar daryo oqimining tezligi 3 m/S bulsa, kater suvga nisbatan qanday tezlik bn yuriwi kerak