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svetazuna

1)

48 : 4 = 12 км/ч - скорость против течения,

2)

12 + 3 = 15 км/ч - собственная скорость,

3)

15 + 3 = 18 км/ч - скорость по течению,

4)

48 : 18 = 48/18 = 2 2/3 ч  (или  2 ч 40 мин) - вернется назад

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