ответ: 3 5/12 км/час. 46 км/час.
Пошаговое объяснение:
Скорость моторной лодки по течению реки равна 49 5/12 км/ч,
а против течения- 42 7/12 км/ч.
Решение.
Найдем разность скоростей V по течению и V против течения - это двойная скорость реки
2V реки = 49 5/12 - 42 7/12 = (49-42) + (5-7)/12 = 6 (12+5-7)/12 = 6 10/12=6 5/6 км/час.
V реки = 6 5/6 : 2 = 41/6 : 2 = 41/12 = 3 5/12 км/час.
Собственная скорость лодки равна
V по течению - V реки = 49 5/12 - 3 5/12 = 46 км/час.
или
V против течения + V реки = 42 7/12 + 3 5/12 = 45 (7+5)/12 = 46 км/час.
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Пошаговое объяснение:
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