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skim62143

Ответ:

Пошаговое объяснение:

Их производительность 1/18 (Улан), 1/13 (Леша) и 1/26 (Карина).


Их суммарная производительность:


frac{1}{18}+frac{1}{13}+frac{1}{26}=frac{1}{18}+frac{3}{26}=frac{1*13+3*9}{9*26}=frac{40}{9*26}=frac{20}{117}

Тогда времени они затратят:


t=frac{1}{frac{20}{117}}=frac{117}{20}=5frac{17}{20} мин

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